Can I give a double dose to make up for a missed one?

No. Don't double up on your own. Blue Cross, the UK animal charity, says in its guide to antibiotics for dogs never to double up to make up for a missed dose, and VCA Animal Hospitals' medication handouts say not to give two doses at once. Ask your vet what to do about the next dose instead. If you think a dose may have been given twice, call your vet right away.

How far apart should twice-a-day dog medicine be given?

The spacing is set for each medicine by the vet who prescribed it, so check the label or the written instructions first, and call the clinic if they don't say. What to do when a morning dose runs late also differs from one medicine to another. Ask at your next visit and write the answer down, so it's there the next time you're unsure.

Is it the same if I forgot to give my cat their medication?

Yes, the same steps apply: don't double up, have the time of the last dose and the name of the medicine ready, and call your vet. Most of the sources in this guide are written about dogs, though. For a cat's heart, kidney or thyroid medicine, ask the vet who treats your cat what to do about a missed dose.

Forgot to Give Your Dog Their Medication? Don't Double Up. Here's What to Tell Your Vet

Q: I forgot to give my dog their medication. Should I give it as soon as I remember?

It depends on the medicine, so don't decide on your own: call your vet. Healthline, in an article reviewed by a veterinarian, explains that the right next step can depend on the type of medication, how long until the next dose and how long it has been since the missed one. Have the time of the last dose, who gave it and the name on the label ready, and ask what to do about the next dose. If your clinic is closed, call an emergency vet. Don't give two doses at once.

Q: My dog threw up their medication. Do I give more?

Check with your vet before giving more. The FDA explains that it depends on the medicine: some break down in the stomach faster than others, so a pet that immediately vomits a medicine that breaks down quickly may already have absorbed some of it, and another dose could mean too much. When you call, say what time you gave the dose, what time your dog vomited, the name of the medicine and what came up. Take a photo of the vomit before you clean it up, so you can say whether the pill was in it.

It's 9pm, and you're putting the pill organizer away when you stop. This morning's compartment is still full.

It wasn't a normal morning. One of you left before sunrise for an early shift. The other was getting the house ready for guests. Your dog gets a heart pill every morning and hasn't missed one in over a year. Each of you thought the other had given it.

Neither of you takes the dog's medicine lightly. It slipped because it's so routine: on the one morning the routine broke, it fell between the two of you.

If you forgot to give your dog their medication, do three things. Don't double up on your own. Have the exact time of the last dose ready, along with who gave it and the name on the label. Then call your vet and ask what to do about the next dose. That's the whole answer. If your dog is on insulin, seizure, heart or steroid medicine, we suggest making that call sooner rather than later.

This post is about the daily medicines a dog takes for months or years, and the one dose that got missed. For a monthly heartworm or flea and tick preventive, see what to do if you forgot your dog's heartworm or flea and tick preventive. For the opposite problem, when two people both gave the dose or nobody can tell whether it was given, see our guide to preventing double doses. A missed dose and a double dose are two sides of the same problem.

This is a guide to keeping records, written by Memofu's developer, not a veterinarian. It is not veterinary advice. What to do about a missed dose, and when to give the next one, depends on the medicine: always ask your own vet.

If you've just realized a dose was missed

First: don't give two doses at once. Have the time of the last dose, who gave it and the name on the bottle or pharmacy label in front of you, and call your vet. If your clinic is closed, call an emergency vet.

Call right away if a seizure lasts longer than 5 minutes, or seizures come one after another without your dog fully regaining consciousness in between. The Merck Veterinary Manual defines that as status epilepticus, and VCA Animal Hospitals calls status epilepticus a medical emergency.

The same goes for a dog with heart disease that coughs at rest or while sleeping, breathes faster at rest, pants heavily, has a swollen belly, or has pale or bluish gums. VCA's guide to congestive heart failure asks owners to notify their vet immediately if signs like these develop in a pet with a heart murmur.

Otherwise: write down the time you noticed, then call. Don't decide on the next dose by yourself. Being unsure is reason enough to call.

I forgot to give my dog their medication. Should I give it now?

It depends on the medicine, so ask your vet rather than deciding on your own. Whether to give it now or wait for the next dose is a call for the vet who prescribed it.

Healthline's guide to missed pet doses, written by a pharmacist and reviewed by a veterinarian, starts with a phone call: "Call their veterinarian to find out the best next steps for your pet." It explains that the answer may depend on the type of medication, how long until the next dose, and how long it has been since the dose was missed. The FDA's list of questions for your vet says the same: if you missed a dose, your vet will be able to tell you when to give the next one.

You'll also find rules of thumb online. Healthline, for one, says skipping is often safer when the next dose is close, then adds that it is always best to confirm with your vet. A general rule can't account for your dog's particular medicine or condition.

Can I double the next dose to make up for the missed one?

No. Don't give two doses at once to catch up.

Blue Cross, the UK animal charity, says it directly in its guide to antibiotics for dogs: "Never double up to make up for a missed dose." VCA's medication handouts say it too. Its handouts for a heart medicine and a steroid read: "Do not give the pet two doses at once." Its handout for a seizure medicine reads: "Never give your pet two doses at once or give extra doses." For insulin, Healthline warns: "Because insulin dosing is precise, never double up or give extra insulin without talking with your pet’s veterinarian."

Catching up turns one missed dose into a double dose: a second problem, not a fix. If you think a dose may have been given twice, call your vet right away. Our guide to preventing double doses covers what to do next.

What should you tell the vet about a missed dose?

Tell them when the last dose was given and by whom, the medicine's name, when you noticed and when the next dose is due, and anything unusual you've seen. With those four, your vet can decide what to do about the next dose.

When the last dose was given, and by whom. "Last night" is vague. "7:40 last night, Dad gave it" is something the vet can work with, and it tells you who to double-check with.
The name of the medicine. Have the bottle, blister pack or pharmacy label in your hand, whether it came from your clinic, a drugstore or an online pet pharmacy. If they ask how much your dog takes, read it off the label exactly as written.
When you noticed, and when the next dose is due. These answer Healthline's two timing questions: how long since the missed dose, and how long until the next one.
Anything unusual, and since when. Coughing, breathing, appetite, energy. If there's nothing, say your dog is acting normally.

The hard part is often the first item. On a normal morning, whoever gave the dose remembers. On a disrupted one, nobody is sure. That's why it's worth writing down who gave it and when, right as it happens. For putting symptoms into words, see how to describe your pet's symptoms to the vet.

What if you forgot your dog's insulin, seizure, heart or steroid medication?

We suggest calling your vet as soon as you notice rather than waiting for the next dose. The sources below warn about these medicines being given erratically, doubled or stopped suddenly. VCA's medication handouts for a steroid and for a seizure medicine both say not to stop the medicine abruptly, and the Merck Veterinary Manual describes what sudden stopping can do. None of them sets a deadline for a single missed dose, and some medication handouts give a routine missed-dose rule. That's why the call belongs with the vet who knows your dog's plan. The medicines are grouped here by type, not drug name.

Forgot your dog's insulin shot

Insulin is built around a schedule. The American Animal Hospital Association (AAHA) explains that diabetic dogs and cats "need daily injections of insulin at regular times of the day to help regulate glucose (blood sugar) levels in their body."

Healthline notes that a missed insulin dose can let blood sugar rise, with mild signs like more urination and thirst, or serious ones like diabetic ketoacidosis.

Too much is dangerous too: Healthline says doubling up can cause hypoglycemia (low blood sugar). VCA's guide to insulin treatment in dogs reminds owners that "it is always better in the short term for the blood sugar to be too high than too low," and Cornell's Feline Health Center warns that insulin therapy can lower blood glucose to dangerously low levels. VCA also says not to give additional insulin if you're unsure an injection went in correctly. So after a missed injection, call your clinic before the next one is due. If your dog has already eaten by the time you notice, say so when you call.

Forgot your dog's seizure medication

The American Kennel Club stresses keeping anti-seizure medication on schedule: "Giving the medication erratically can increase the dog’s seizure frequency and severity." VCA's guide to epilepsy in dogs agrees that forgetting pills can make blood levels fluctuate and may lead to more frequent or more violent seizures. The Merck Veterinary Manual adds that abruptly stopping some anti-seizure drugs can produce severe withdrawal seizures.

Merck also advises that "Owners should be instructed to keep a calendar to document the frequency and pattern of seizures." Note missed doses on the same calendar, and you and your vet can look at both together.

Forgot your dog's heart medication

VCA's guide to congestive heart failure notes that many heart medications are available and that "the treatment regime must be tailored for each patient." A veterinarian writing for Petkusuri, a Japanese online pet pharmacy that imports medicines for individual buyers, warns that a missed heart-medicine dose can be life-threatening. As an example, that veterinarian writes that missing even one dose of a diuretic can leave extra fluid in the body and lead to signs like pulmonary edema. That is one veterinarian's view on a retailer's site, though. Only the vet who knows your dog's plan can say which medicine matters most after a missed dose.

If any of the heart signs in the box at the top of this page show up after a missed dose, call your vet right away: VCA says those signs mean notifying your vet immediately. If your vet has you track your dog's resting breathing rate, as the same VCA guide describes, give them the latest count.

Forgot your dog's steroid medication

Steroids taken long term shouldn't be stopped suddenly. The Merck Veterinary Manual explains that in animals on long-term treatment, stopping abruptly can lead to an Addisonian-like crisis, with lethargy, weakness, vomiting and diarrhea. VCA's handout says: "Do not stop this medication abruptly; taper it slowly to avoid complications."

These warnings are about stopping suddenly; they don't say what a single missed tablet does. That's for your vet to judge, so tell them about a missed dose promptly and ask what to do next.

Other daily medicines, monthly preventives and cats

For antibiotics and other daily medicines, such as thyroid, pain or anxiety medicines, the same three steps apply: don't double up, have the time of the last dose ready, and call your vet.

Monthly heartworm, flea and tick preventives are a different question: Healthline notes a vet may recommend a blood test before restarting a missed heartworm preventive. See our guide to missed heartworm and flea and tick preventives.

If you forgot to give your cat their medication, the same steps apply. But most sources here are about dogs, so for a cat's heart, kidney or thyroid medicine, check with the vet who treats your cat.

My dog threw up their medication. Do I give more?

Call your vet before giving more. They'll want to know when you gave it, when your dog vomited, which medicine it was and what came up.

The FDA explains why there's no single answer: it depends on the medicine. Some medicines break down in the stomach faster than others, so a pet that immediately vomits a medicine that breaks down quickly may already have absorbed some of it, and another dose could mean too much. Before you call, gather:

The time you gave the dose. If there's a record, check it.
The time your dog vomited. If you didn't see it, give the time you found it, and say so.
The name of the medicine. Keep the bottle or label in your hand.
A photo of what came up. Close enough to show whether a tablet or capsule is visible.

You won't find a rule here like "if your dog vomits within X minutes, give it again." Some pages give one, but the answer depends on the medicine.

How far apart should twice-a-day doses be?

The spacing is set for each medicine, and the instructions should be on the label or the pharmacy bag. If they aren't, ask the clinic. Blue Cross puts it this way in its guide to antibiotics for dogs: "Your vet will tell you how to give your dog antibiotics. The instructions will also be displayed on the packet." At your next visit, also ask what to do when a morning dose runs late.

Why do daily doses get missed in a family?

Because a daily dose becomes part of a morning routine, and on the day that routine breaks, each person assumes the other one gave it.

Healthline suggests tying the dose to your own routine, like breakfast. That works, until the morning the routine doesn't happen and the dose slips by unnoticed. In a family, there's a second trap: each of you can be sure the other one handled it. It tends to happen on days like these:

The staggered morning. Whoever leaves first thinks the later person will give it, and the later person thinks it's done.

Guests or travel. The usual order breaks, and the pill bottle isn't where it always is.

The usual person is away. If one person always handles it, nobody else knows what goes in when.

The dog is staying somewhere else. With a relative, boarding facility or sitter, the dose is given by someone who has only heard the instructions. For a kennel, see what to hand a boarding facility with the medicine; for a relative or sitter, see what to leave for a dog sitter.

Several medicines, several schedules. The AKC's guide to epilepsy notes that "Some dogs take multiple medications, on multiple schedules."

Missed doses are easy to underestimate. In a Canadian study of 90 dog owners giving antibiotics (Adams and colleagues, 2005), owners' own reports and pill counts showed no missed doses at the median. Electronic monitors on the containers told a different story: the right number of doses on a median of 91% of days, and only 64% of doses given on time. And "Veterinarians were unable to predict client compliance."

A UK study of prescription records for 94 dogs with epilepsy (Booth and colleagues, 2021) found a median compliance of 56%. On the other hand, a survey of 96 owners of dogs with heart disease at a California referral hospital (Pelio and colleagues, 2021) found that "Medication adherence was high in this study population," though 17.7% said they at least occasionally missed medications. Even careful households miss a dose now and then.

Being more careful doesn't close the gap between two people's routines. What closes it is making "not given yet" visible to everyone who might give the dose, including whoever isn't home: a dose-time reminder on each of their phones, and a record made on the spot showing who gave it and when. A reminder alone, sent to two people, can mean two doses. For organizing care when everyone works, see caring for a senior dog while you work.

What to do this week

None of this needs much preparation:

At the next visit, ask three questions. If we miss a dose, do we give it when we notice or wait for the next one? If our dog vomits a dose, what then? If the morning dose runs late, what about the evening one? The FDA suggests asking your vet: "If I forget to give the medicine, should I give it as soon as I remember or wait until the next scheduled dose?"
Write the answers in your notes from that visit, under what the vet said, next to the medicine's name. On paper, keep them by the pill bottle. At night, you'll have your own vet's instructions in hand.
Count what's left and book the next visit before it runs out, so a missed dose never comes from an empty bottle.
Set a dose-time reminder on everyone's phone, not just the person who usually does it. An alarm or an app, either works.
Record each dose the moment you give it. Who and when, in one agreed place. The household rules in our guide to preventing double doses work here as they are.
Record a missed dose too: when you noticed, and what the clinic said.
Put the phone numbers where everyone can see them. Your vet's and the nearest emergency vet's, by the pill bottle or on the fridge.

Where Memofu fits

Memofu has a medication log and vet visit records. Here's what they can and can't do about a missed dose today.

At each dose time, owners and co-owners get a notification. Set a medication's dose times, and "Notify at dose times" is already on. It reaches people who aren't home, too.
Marking a dose is one tap, and everyone in the circle sees who gave it and when. Tap "Mark as given", and the Today view on the Health tab shows it, like "Given by Sam at 8:05 AM."
It sends one notification per dose. If nobody marks it, it won't repeat on its own. A missed dose stays listed as still to do, so it's spotted by whoever opens the app.
It doesn't ask before a second dose. Everyone gets the notification, so check the Today view before you give it.
Memofu doesn't know what to do about a missed dose. It shows whether a dose was given, by whom and when. The next step is your vet's call.
Your vet's instructions can go in the vet visit record. Write the missed-dose and vomited-dose instructions under "What the vet said", with photos of the prescription. Add the next appointment, and owners and co-owners are reminded 7 days before, the day before and on the day.
Only owners and co-owners can record. Viewers can see the log, but can't mark a dose as given and don't get medication notifications. Family members who give the medicine should be co-owners.
The Android version is still on the way. If someone who gives the medicine can't use Memofu yet, one shared paper record for everyone keeps all doses in one place.
A health link shows a sitter the medication plan. It opens in any browser with no account, expires after 1, 7 or 30 days, and lists current medications with their dose times. It doesn't show who gave each dose or what the vet said, so hand over missed-dose instructions on paper.

The medication log and vet visits, including the full history, are free on every plan, and so are health links. The vet-ready PDF summary is Premium. A full export is free on every plan, for good. There are no ads, no data sales and no public feed. See the features page and the pricing page for details.

One last reminder: this is a guide to keeping records, not veterinary advice. On the night you notice a missed dose, what you need isn't a rule of thumb from a search. It's your vet's phone number.

Sources

What To Do If You Miss a Dose of Your Pet's Medication, Healthline, April 2026
Medications for Your Pet… Questions for Your Vet, U.S. Food and Drug Administration (Center for Veterinary Medicine)
Antibiotics for Dogs, Blue Cross
Diabetes Mellitus: Insulin Treatment in Dogs, VCA Animal Hospitals
Feline Diabetes, Cornell Feline Health Center, Cornell University College of Veterinary Medicine
8 things you need to know about AAHA’s Diabetes Management Guidelines for Dogs and Cats, American Animal Hospital Association
Epilepsy in Dogs: Signs, Symptoms, Treatments, American Kennel Club
Epilepsy in Dogs, VCA Animal Hospitals
Anticonvulsants for Treatment of Animals, Merck Veterinary Manual, 2025
Congestive Heart Failure in Dogs, VCA Animal Hospitals
Corticosteroids in Animals, Merck Veterinary Manual
Prednisolone/Prednisone, VCA Animal Hospitals (medication handout)
Pimobendan, VCA Animal Hospitals (medication handout)
Phenobarbital, VCA Animal Hospitals (medication handout)
Evaluation of client compliance with short-term administration of antimicrobials to dogs, Adams VJ et al., Journal of the American Veterinary Medical Association, 2005
Owner compliance in canine epilepsy, Booth S et al., Veterinary Record, 2021
Evaluation of owner medication adherence for canine cardiovascular disease in the referral setting, Pelio DC et al., Journal of Veterinary Cardiology, 2021
What happens if a dog with heart disease misses its medication (犬の心臓病は薬を飲み忘れたらどうなる？), Petkusuri, 2026 (in Japanese)