This is one of the most common calls veterinary practices take, and it is usually the same story: two people in the house both gave the evening tablet. The drug is right for your dog. What is not right is the total that has now gone in. Call the practice that wrote the prescription, because the dose your dog is normally on is the fact that decides whether this matters, and they are the only ones who know it.
Do this first
- Stop. Do not give anything else, including the next scheduled dose, until you have spoken to someone.
- Write down the time of the last dose you are certain about, and the time of the extra one.
- Count what is left in the container against what the prescription should have left. This turns a guess into a number.
- Read the label: the drug, the strength in milligrams, and whether it says XR, ER, SR or LA.
- Call the prescribing practice. Out of hours, use their emergency line or a poison-control service.
Why this is not the same as a poisoning
An accidental exposure to a human drug starts from zero information: nobody chose that drug for your dog, and the question is what it will do. A doubled prescription dose starts from a great deal of information. Your vet picked the drug, calculated the amount for your dog's weight and condition, and knows what else your dog takes. The question is much narrower: does twice that amount, at this interval, matter for this dog.
That is why the prescribing practice is a better first call than a general poison-control line for this specific situation, though either will help and both are better than waiting. If your dog got into a human medication instead, our guide to what to do when a dog eats human medication is the right starting point.
What decides whether it matters
| Factor | Why it changes the answer |
|---|---|
| Which drug | The margin between the prescribed amount and a harmful one differs enormously. Some drugs tolerate a doubled dose with nothing worse than sedation; others do not. |
| How far apart the two doses were | Two tablets ten minutes apart and two tablets six hours apart are different events for the same drug. |
| Immediate or extended release | An extended-release product keeps releasing for hours, so the overlap between the two doses is longer and the monitoring period is longer with it. |
| What the drug is for | An overdose usually looks like an exaggerated version of the intended effect: more sedation from a sedative, a lower heart rate from a heart drug, lower blood sugar from a diabetes drug. |
| Your dog's kidneys and liver | These clear most medications. A dog with reduced function holds on to the extra dose for longer. |
| Everything else your dog takes | Interactions are often the more important half of the problem, particularly with heart and seizure medications. |
The medications this happens with most
These are the drugs dogs are on long-term, which is exactly why they are the ones that get given twice. Several of these pages are still held pending veterinary review; those that are live are linked.
- Pain and inflammation: carprofen and meloxicam are the common ones, and a doubled NSAID dose is worth a prompt call because of the stomach and kidney effects.
- Anxiety and behavior: trazodone and gabapentin, where the usual result is more sedation than intended.
- Seizures: levetiracetam and phenobarbital. Never adjust a seizure medication schedule yourself, in either direction.
- Skin and allergies: Apoquel and prednisone.
- Nausea and gut: ondansetron, metronidazole and omeprazole.
- Antibiotics: amoxicillin, cephalexin and doxycycline, where an extra dose most often means stomach upset.
- Muscle relaxants and nerve pain: methocarbamol and pregabalin.
- Heart: sildenafil, spironolactone and the blood-pressure drugs, where blood pressure dropping is the concern.
- The full group sits under veterinary prescriptions and accidental double doses.
When your dog emptied the whole bottle
This is a different event from a doubled dose and should be treated as an emergency exposure rather than a dosing question. Flavored chewable medications are designed to be palatable to dogs, which is a virtue right up until the container is left within reach, and a dog that has eaten a month of tablets has taken a quantity nobody calculated. Call immediately, take the container, and do not wait for signs.
Stopping it happening again
- Use a chart on the fridge or a shared phone reminder that someone marks off, rather than relying on memory in a household with more than one person.
- Keep the dog's medication somewhere that requires a deliberate action to open, not on a counter.
- Treat flavored chewables as food, because your dog does.
- Write the dose and time on the container itself, so whoever picks it up next sees it.
- Keep the prescription label attached. It is the single most useful object in any of these phone calls.
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Frequently asked questions
My dog got two doses of its medication. Should I skip the next one?
Ask the prescribing practice rather than deciding. For some medications skipping is right, for others, particularly seizure and heart drugs, it introduces a second problem. They know your dog's dose and schedule, which is what the answer depends on.
Is a double dose of my dog's own medication actually dangerous?
It depends almost entirely on which drug. Some have a wide margin and a doubled dose causes nothing worse than sedation or a loose stool; others have a narrow one. Because that varies so much, the useful step is a phone call with the label in front of you rather than a general rule.
Who should I call, my vet or poison control?
For a doubled dose of your dog's own prescription, the prescribing practice first: they hold the dose and the history. Out of hours, use their emergency line, or ASPCA Animal Poison Control or the Pet Poison Helpline, both of which run 24 hours.
My dog seems completely normal. Do I need to do anything?
Still make the call, but it can be a calm one. Some effects are delayed, extended-release products act over many hours, and the practice may simply want to know so they can adjust the next dose. Normal behavior is reassuring, not conclusive.
What if my dog ate the whole bottle rather than one extra tablet?
Treat that as an emergency exposure and call immediately. It is no longer a dosing question, and flavored chewable medications make it easier than owners expect for a dog to get through a lot quickly.