Quick Take
- Prozac® can actually make some dogs more dangerous, though this happens only under one specific condition that most owners overlook. See hostility risk →
- Your dog could be on Prozac® for weeks before you know if it's even working, and that waiting window matters more than you think. Check the waiting period →
- Some common household supplements could make Prozac® dangerous for your dog, something most vets won't mention unless you ask. Review drug interactions →
- The signs of a Prozac® overdose in dogs look nothing like what most owners expect, and mistaking them for normal side effects can be fatal. Spot overdose warning signs →
Veterinarians prescribe Prozac® (fluoxetine), a selective serotonin reuptake inhibitor (SSRI), to help regulate a dog’s mood and address chronic stress behaviors. It is used primarily to treat canine separation anxiety, but vets also prescribe it for general anxiety, noise phobias (such as thunderstorms), and certain types of aggression. Prozac® may also be prescribed to manage obsessive-compulsive and repetitive behaviors, such as excessive paw licking, tail chasing, or pacing, as well as inappropriate urine marking indoors. If your dog has been prescribed Prozac®, you may be concerned about the risks, side effects, and correct dosage. Continue reading to learn everything you need to know.
Under no circumstances should you ever give Prozac® prescribed for you to your dog.
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Does Your Dog Need Prozac®?
Dogs rely heavily on socialization and interaction with their owners. However, when a dog becomes so attached to and focused on their owner that they cannot respond to cues or commands — this dependency, known as hyperattachment, becomes a behavioral problem that can develop into separation anxiety, where the dog experiences significant distress when left alone.
Prozac® for dogs may also help with the following:
- Fear of people
- Unwanted urination
- Fear of thunder
- Generalized anxiety
- Compulsive disorders
- Aggression
When therapy is ineffective and a dog destroys furniture, toys, and their crate, they may require help from Prozac®.
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Risk Factors
You may want to discuss alternatives to Prozac® if your dog has any of the following conditions:
- Seizure disorders
- Puppies 6 months of age or younger (should avoid Prozac®)
- Known history of allergies to Prozac®
- Currently taking MAO inhibitors
- Specific concurrent medications and supplements
Before starting your dog on Prozac®, your vet will most likely give them a comprehensive exam to rule out any other issues that could be causing the anxiety. For example, if your dog has a torn ligament, the resulting pain may cause anxiety.
Additionally, Prozac® may take time to work; in most cases, it does not reach its full effect until your dog has been taking it for at least four to eight weeks.
You should also avoid giving Prozac® to any dog that is pregnant or lactating.
Prozac® may not take full effect until your dog has been taking it for at least four weeks.
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Side Effects
Like many drugs, Prozac® can cause adverse side effects. This is why, whenever you administer Prozac® or its veterinary equivalent, whether through chewable tablets, capsules, or liquid, it is crucial to monitor your dog. Some common side effects of Prozac® for dogs include:
- Drowsiness
- Loss of appetite
- Vomiting
- Diarrhea
- Shivering
- Apprehensiveness
- Crying
- Stumbling
- Excessive drooling
- Weight loss
In rare cases, Prozac® for dogs can cause dangerous side effects such as:
- Seizures
- Hostility
- Persistent vomiting
If your dog shows any of these side effects, contact your veterinarian as soon as possible.
After administering Prozac®, it is important to watch your dog closely and monitor its reaction.
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Signs of Prozac® Overdose in Dogs
In addition to the mild and severe side effects listed above, overdose is also a concern.
Signs of canine Prozac® overdose include:
- Extreme fatigue
- Irritability
- Refusing to eat
- Difficulty walking
- Rapid breathing
- Slowed heart rate
- Weakness or collapse
If any of these signs are present, contact your veterinarian or an emergency animal poison control hotline (such as the ASPCA Animal Poison Control Center) immediately.
Prozac® for Dogs Dosage Chart
The following chart is intended as a general guideline only and should not be used to administer Prozac® to your dog without a prescription. Prozac® must be prescribed by a veterinary professional.
| Weight in pounds | Dosage in mg |
|---|---|
| 5 | 2.5 |
| 10 | 5 |
| 15 | 7.5 |
| 20 | 10 |
| 25 | 12.5 |
| 30 | 15 |
| 35 | 17.5 |
| 40 | 20 |
| 45 | 22.5 |
| 50 | 25 |
