Dogs with separation anxiety can be helped with a combination of prescription medications, supplements, calming tools, and behavior training. No single product works as a magic fix, but the right combination can significantly reduce destructive behavior, excessive barking, house soiling, and the distress your dog feels when you leave. Here’s what’s available and what the evidence actually supports.
Prescription Medications for Daily Use
Two medications are most commonly prescribed for ongoing separation anxiety in dogs. Clomipramine (sold as Clomicalm) is the only FDA-approved medication specifically for canine separation anxiety. It works by increasing levels of mood-regulating brain chemicals, and it’s approved for dogs over six months of age as part of a broader behavior management plan. The key phrase there is “part of.” Vets prescribe it alongside training, not as a standalone solution.
Fluoxetine, the same active ingredient in Prozac, is widely used off-label for dogs with separation anxiety. It works similarly by boosting serotonin levels in the brain. Both medications take several weeks to reach full effect, so you won’t see results overnight. Early side effects are common and typically mild: decreased appetite and drowsiness are the most frequent. Some dogs also experience vomiting, diarrhea, restlessness, or shaking. Serious side effects like seizures or aggression are rare but possible.
Fluoxetine should not be given to dogs with a history of seizures, dogs younger than six months, or dogs already taking certain other medications. Combining fluoxetine with clomipramine or trazodone without veterinary guidance can cause serotonin syndrome, a potentially dangerous condition involving agitation, tremors, and elevated body temperature. These medications require a prescription and careful dosing from your vet.
Fast-Acting Medications for Acute Distress
Sometimes your dog needs relief right now, not in four weeks. Several short-acting medications can help bridge that gap or manage particularly stressful departures.
Trazodone is one of the most commonly prescribed options. It promotes calmness and improves confinement tolerance, kicking in within about 35 to 45 minutes and lasting at least four hours. Many vets prescribe it alongside a daily medication during the first few weeks while the long-term drug builds up in your dog’s system.
Alprazolam (the same drug as Xanax in humans) can be used as needed when a dog becomes severely distressed. It typically takes 30 to 60 minutes to take effect. It’s sometimes used as an add-on to daily separation anxiety medication rather than a primary treatment.
A gel form of dexmedetomidine (sold as Sileo) is applied between the dog’s cheek and gum and works within about 20 minutes. It’s FDA-approved for noise phobias but has applications for the acute arousal phase of separation distress as well. Your vet can help determine which situational medication fits your dog’s specific pattern of anxiety.
CBD Oil
CBD has attracted a lot of interest from dog owners, and there’s now some clinical evidence behind it. A peer-reviewed study published in Frontiers in Veterinary Science found that a single dose of THC-free CBD (about 4 mg per kilogram of body weight), given two hours before a separation event, reduced several stress indicators. Dogs who received CBD whined significantly less during separation and were rated as less sad, stressed, tense, and uncomfortable compared to dogs given a placebo. Their cortisol levels (a stress hormone) were also lower overall.
Short-term dosing up to 20 mg/kg daily appears safe in healthy dogs, and a six-month study found 4 mg/kg daily was well tolerated. Doses above 4 mg/kg have caused mild side effects in some studies. The big caveat: CBD products for pets are not regulated the way medications are, so quality varies enormously. Look for products that provide third-party lab testing and contain no THC.
Supplements and Nutraceuticals
If you’re looking for something less intensive than a prescription, a few supplements have at least some veterinary research behind them.
L-theanine, an amino acid from tea plants, has shown benefits in reducing fear of strangers and noise phobias in dogs. It works by influencing several brain chemicals involved in mood and excitability. The catch is that L-theanine supplements need to be given daily and may take four to six weeks to show a therapeutic effect, similar to prescription medications.
Alpha-casozepine, derived from a protein in cow’s milk, promotes calm by acting on the brain’s primary inhibitory signaling system. Some studies show it reduces anxiety and fear of strangers in dogs, though results have been mixed. One study found it helped dogs cope with stress, while another found no measurable effect on anxiety levels. Products containing alpha-casozepine are sold under brand names like Zylkene.
Neither supplement is likely to resolve moderate or severe separation anxiety on its own, but they may take the edge off mild cases or work as part of a broader plan.
Pheromone Diffusers and Collars
Dog-appeasing pheromone (DAP) products mimic a natural pheromone that nursing mothers produce to calm their puppies. They come as plug-in diffusers, sprays, and collars. In a controlled study of dogs separated from their owners, DAP significantly reduced elimination accidents, excessive licking, and pacing compared to a placebo group. One study even found no significant difference in effectiveness between DAP and clomipramine for separation-related behavior problems.
Pheromone products won’t sedate your dog or change their brain chemistry the way medication does. They’re best thought of as a low-risk layer you can add to your approach. Diffusers are typically placed on the wall in the room where your dog spends most of its time alone and need to be replaced monthly.
Pressure Wraps and Calming Vests
Products like the ThunderShirt apply gentle, constant pressure to your dog’s torso, similar to swaddling a baby. One study found that dogs wearing a tightly fitted pressure wrap had a smaller spike in heart rate after being isolated in a kennel compared to dogs wearing a loose wrap or no wrap at all. Dogs without the wrap were also more likely to orient toward the door, suggesting more vigilance and distress.
That said, a 2024 systematic review of all available research concluded that the evidence supporting pressure wraps is weak and limited. The studies are small, findings are inconsistent, and most other behavioral signs weren’t significantly affected by wearing the vest. A pressure wrap is unlikely to hurt, and some individual dogs do seem to respond well, but it shouldn’t be your primary strategy for a dog with genuine separation anxiety.
Behavior Training Alongside Any Treatment
Every medication and supplement works better when paired with behavior modification. The core technique is called desensitization: gradually increasing the length of time you’re away so your dog learns that departures are safe and that you always come back. This means starting with absences so short your dog doesn’t react at all, sometimes just stepping outside the door for a few seconds, and building from there over days and weeks.
Counter-conditioning pairs your departure with something your dog loves. A food puzzle or long-lasting chew given only when you leave can start to shift the emotional association from “you’re leaving me” to “good things happen when you go.” Avoid making a big fuss when you leave or return, since dramatic greetings reinforce the idea that your absence was a significant event.
For moderate to severe cases, working with a veterinary behaviorist or a certified applied animal behaviorist can make a real difference. These professionals can design a structured desensitization plan tailored to your dog’s specific triggers and pair it with the right medication protocol.
What to Avoid
Never give your dog human medications without veterinary guidance. While some of the same drugs are used in both humans and dogs, the doses are completely different, and human formulations may contain ingredients that are toxic to dogs. Accidental ingestion of human antidepressants can cause serotonin syndrome in pets, leading to agitation, tremors, dangerously high body temperature, heart arrhythmias, seizures, and death. Human benzodiazepines like Xanax or Valium can cause profound sedation, lethargy, and coma in dogs at human doses. ADHD medications like Ritalin or Adderall can cause elevated heart rate, high body temperature, and seizures.
Punishment is also counterproductive. Scolding your dog for destruction that happened while you were gone doesn’t teach them anything about the behavior. They can’t connect your anger to something they did hours earlier, and it adds fear on top of anxiety, making the problem worse.