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You are likely familiar with antidepressants for humans, but their use in dogs is less commonly understood. We tend to think that dogs live in the moment and find joy in the simplest of things. Why would they need drugs to lift their mood? In fact, antidepressants aren鈥檛 usually used to treat depression in dogs. Instead, they鈥檙e most often prescribed for canine anxiety and can serve as an important component of a behavior modification plan.

If your dog is nervous or fearful, antidepressants could be a beneficial part of helping them feel more confident and comfortable with the world.

What Are Dog Antidepressants?

According to Dr. Jerry Klein, Chief Veterinarian for the American Kennel Club, veterinarians use a wide range of drug classes (anxiolytics, antipsychotics, antidepressants, and mood stabilizers) to treat behavior. 鈥淭hese types of drugs are recently being used more commonly in veterinary medicine as adjuncts to behavior modification therapy and training on some difficult or challenging dogs where training and therapy alone have not achieved the desired behavioral change,鈥� he says.

There have only been a few veterinary clinical studies on these drugs, so the guidelines for veterinary use are based on therapeutic applications in humans. Therefore, although some of these medications are approved for dogs in specific situations, such as for canine separation anxiety, many are used off-label. That means they don鈥檛 have FDA approval for that specific use. However, they can still be safe and effective for treating your dog when properly prescribed by a veterinarian.

Some of the more commonly prescribed behavioral medications for dogs include:

• Tricyclic antidepressants, such as clomipramine or amitriptyline
• Serotonin antagonist and reuptake inhibitors (SARIs), such as trazodone
• Selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine (Prozac) or paroxetine
• Benzodiazepines. such as diazepam (Valium) or alprazolam

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Why Are Dog Antidepressants Prescribed?

Veterinarians prescribe certain canine behavior medications as anxiolytics, or antianxiety drugs, for dogs with behavior issues. The medication can help a dog cope in the moment or help with training and behavior modification, like counterconditioning and desensitization. Some common reasons a veterinarian might prescribe antidepressants to a dog include:

• Noise phobia, such as fear of fireworks
• Fear of places the dog rarely visits, like the vet鈥檚 office
• Upcoming car rides or airplane travel
• Separation anxiety
• Reactivity around other animals or people
• Any behavior that can harm the dog, other members of the household, or the environment

In some of these situations, the goal of medication is to get a dog through a stressful event, like a flight or fireworks display. Veterinarians also often use medication as part of a broader treatment plan. 鈥淒ifferent medications can be used individually or in combination when methods of basic training and desensitization are not working or have reached a plateau,鈥� Dr. Klein explains. 鈥淭hese medications are often, and should be, utilized as an adjunct with proper training and desensitization.鈥�

How Do Dog Antidepressants Help?

Behavior modification is a powerful tool. However, it鈥檚 only effective when dogs are below threshold, meaning when a dog isn鈥檛 reacting emotionally to a situation. For a reactive dog who lunges at other dogs, for example, that might be when the other dog is 20 feet away. Unfortunately, when a dog is over threshold, it鈥檚 impossible to teach them alternative behaviors or change their emotional response. And for certain triggers, like another dog in the house, it can be extremely difficult to prevent a dog from reacting. That鈥檚 where behavioral medications can come in.

When a dog鈥檚 anxiety is so severe that they can鈥檛 avoid their triggers or stay below threshold, the addition of behavioral drug therapy can allow the dog to learn. That improves their response to training and behavior modification. Drugs are also useful when a dog is dangerously over-reactive, such as when they experience fear-based aggression. Medication can make the situation safer for all involved and, again, allow the dog to learn new associations and behaviors.

Depending on the medication used, results may be almost instant or take up to a month. Certain drugs take effect in only one or two hours. Some dog owners use these drugs are an option to sedate their dogs, such as during fireworks for a dog with noise phobia. Other drugs may take several weeks before you鈥檒l notice any behavioral change in your dog.

Dr. Klein emphasizes that this type of treatment takes time, persistence, and patience. 鈥淯nfortunately, too often in today鈥檚 world, people want an instant result and may not be able to offer the time and effort required,鈥� he says. 鈥淚n this instance, a certified behaviorist or trainer should be consulted.鈥�

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How Safe Are Dog Antidepressants?

Overall, behavioral medications are safe and effective for dogs. However, side effects can occur and depend on the drug used and the underlying history of the animal. Some frequently seen side effects include central nervous system depression, vomiting, drooling, diarrhea, constipation, hyperexcitability, changes in heart rate and blood pressure, reduced tear production, and weight gain. If your dog experiences side effects, your veterinarian can reduce the dose or try a different medication. Dogs undergoing long-term use of these drugs should see their vet for regular health monitoring.

Never change, increase, or decrease your dog鈥檚 antidepressants without your veterinarian鈥檚 direction. If stopped cold turkey, some behavioral medications could cause potential danger to your dog. And, of course, never give medication to your dog that a veterinarian didn鈥檛 prescribe for them specifically. Only a veterinarian should diagnose your dog鈥檚 condition.

鈥淎ny dog exhibiting changes in behavior, lethargy, or a decrease in appetite should not be assumed by the owner to be 鈥榙epressed,'鈥� Dr. Klein says. 鈥淚nstead, dogs exhibiting those signs should see a veterinarian at once for a thorough examination which may include lab work and other diagnostics to rule out any underlying medical condition.鈥�