Dog & cat health · Vet-reviewed guide
Fluoxetine for Dogs Dosage: How Vets Set It
There's no safe one-size dose of fluoxetine for dogs, which is why you won't find a chart here. The right amount is a vet's call, and here's why it varies so much.
The fluoxetine dose for dogs is weight-based and set by your veterinarian, who starts low and adjusts, so there is no safe one-size chart to follow at home. Vets often begin lower for the first couple of weeks to reduce side effects. Never adjust the dose yourself; ask your vet.
About fluoxetine for dogs & cats: this is a prescription medication your veterinarian can prescribe. Read our guide, or ask us if you need help sourcing it.
Why we don't publish a dose-it-yourself chart
Fluoxetine is a prescription medication, and the correct dose depends on your dog's weight, other health conditions, and individual response.1 Publishing a "give this many mg" chart would invite dangerous self-dosing, and a fixed number is not always the answer because the right dose depends on the underlying dog. Our licensed veterinarians set the dose for your specific dog.
How vets approach the dose
Vets commonly start fluoxetine at a lower dose for the first couple of weeks to minimize early side effects, then reassess.2 It is usually given once daily, with or without food. If your dog vomits or stops eating, your vet may adjust timing or dose. After four to eight weeks, the vet judges whether it is working and whether to adjust.
Consistency matters more than the exact pill
Give it exactly as directed, at the same time each day, and do not switch products or stop without telling your vet.2 If a refill looks different, confirm with the pharmacy so a change isn't mistaken for a side effect. Never double up to "catch up" on a missed dose; ask your vet what to do.
Getting the right dose
Our vets calculate and prescribe the correct dose for your dog as part of the review. See how our vet prescription service works. For the bigger picture, see our fluoxetine for dogs guide.
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Frequently asked questions about fluoxetine for dogs dosage
What is the dosage of fluoxetine for dogs?
It's weight-based and set by your vet, who usually starts low and adjusts. Because too much can be dangerous and the right amount depends on your dog's weight, health, and response, we don't publish a self-dosing chart — a vet calculates it.
How often is fluoxetine given to dogs?
Usually once a day, with or without food, at the same time each day. Consistency matters. Your vet may adjust timing if your dog has stomach upset. Never stop or change the dose without veterinary guidance.
What if I miss a dose of my dog's fluoxetine?
Ask your vet — generally you give it when you remember, but if it's almost time for the next dose you skip the missed one. Never double up. Don't stop the medication abruptly, as dogs can have withdrawal effects.
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Sources & References
- PetMD (veterinarian-reviewed). "Fluoxetine (Prozac, Reconcile) for Dogs." petmd.com
- GoodRx Pet Health / VCA Animal Hospitals. "Prozac (Fluoxetine) for Dogs." goodrx.com
Reviewed by Dr. Olivier Toulza. See our clinical reviewers.