For dogs who fear both thunder and the front door

Doges Editorial · 2026-06-25 · 5 min read

The FDA has approved Tessie (tasipimidine), the first drug ever cleared to treat both noise aversion and separation anxiety in dogs. Two of the most common fears, one prescription.

Think about the last time you left for an early flight. The bag by the door, the keys coming off the hook, the moment the front door pulled shut. Your dog knows that sequence, probably from the moment the suitcase appeared. A 2020 study of 13,700 dogs published in Scientific Reports found that nearly three-quarters showed at least one anxiety-related behavior [5]. Noise sensitivity was the most common, affecting about 32%, and fear of fireworks affected about 26%. Separation anxiety ranks among the behavioral problems owners report most often. For those dogs, that sequence doesn't produce waiting. It produces panic.

On May 6, 2026, the FDA approved Tessie (tasipimidine oral solution), the first medication ever labeled to treat both noise aversion and separation anxiety in dogs [1][2]. July 4th fireworks are two weeks away.

Two fears, one prescription

For years, veterinarians treating anxious dogs faced a structural problem. A dog terrified of fireworks required one medication. A dog with separation anxiety required something different. If the dog had both, options were fragmented. The two conditions frequently overlap in the same dog, and the 2020 Scientific Reports study found high comorbidity between different anxiety types [5]. Each condition required a separate prescription and was managed on a different protocol, even when both traced back to the same underlying fear response.

Both noise aversion and separation anxiety involve the sympathetic nervous system misfiring in response to a trigger. For a noise-averse dog, the trigger is the crack of thunder or a firework. For a separation-anxious dog, it's the jingle of keys or the familiar creak of a gate. The resulting panic looks similar in both cases: pacing, panting, trembling, destructive behavior and an inability to settle.

It's not infrequent to see dogs that present both problems at the same time, so there is definitely an advantage — from a strictly veterinary obligation point of view — that we have a drug that is FDA approved for both problems.

— Dr. Carlo Siracusa, DVM, PhD, DACVB, professor of clinical small-animal behavior and welfare, University of Pennsylvania School of Veterinary Medicine [4]

What tasipimidine does

Tasipimidine is an alpha-2 adrenoceptor agonist, a class of drugs that reduce the body's fight-or-flight response before fear escalates into panic [1][2]. Its manufacturer, Orion, describes the mechanism precisely: tasipimidine blocks the startle reflex and counteracts arousal by targeting specific receptors in the central nervous system. The standard dose is 30 micrograms per kilogram of body weight, given orally about an hour before the expected trigger and, per the FDA label, without food (absorption is delayed when the drug is taken with a meal). It may be given up to three times in a 24-hour period, with at least three hours between doses [3].

Tasipimidine is not a sedative. A sedated dog has been emotionally shut down. A dog given tasipimidine stays present and able to process its environment, without the overwhelming physiological fear response that usually hijacks its attention. A dog too sedated to register the fireworks learns nothing from the experience. One that's merely less terrified may begin to form different associations over time.

Watching a dog hide behind the toilet, rigid and shaking through hours of panic, is one of the harder realities of living with a fearful dog. An effective intervention available before the trigger arrives changes what an owner can do. Prevention replaces consolation.

This is a drug that has a very high bioavailability, so this means that the majority of the drug that we give is actually converted into something effective, something that is helping us.

— Dr. Carlo Siracusa, University of Pennsylvania School of Veterinary Medicine, speaking to dvm360 [4]

What the studies tested

Before approving Tessie, the FDA required two clinical studies. One enrolled 160 dogs with noise aversion. The other followed 224 dogs with separation anxiety across eight weeks [3]. Both ran in real homes against real triggers: actual fireworks, actual departures. The FDA concluded the medication was safe and effective when used as labeled [1]. Tessie is expected to reach U.S. shelves by mid-2027, when Zoetis begins distribution [2].

Reported adverse effects included vomiting, diarrhea, lethargy and mild temporary sedation-related signs such as decreased activity or slight incoordination [3]. The drug requires a veterinary prescription, because anxiety disorders can overlap with pain, cognitive dysfunction and other conditions that also influence behavior. Tessie is manufactured by Orion Corporation and distributed in the United States by Zoetis.

Behavioral anxiety as a medical condition

For a long time, dogs that fell apart during thunderstorms or destroyed the couch when left alone were dismissed as difficult or badly trained. The FDA's approval formalizes what veterinary behaviorists have argued for years: these are fear-based medical conditions with identifiable physiological mechanisms and evidence-based treatments.

Behavioral health in dogs is now treated as seriously as physical health. Many owners spent years feeling responsible for a fearful dog's behavior. The clinical framework points to physiology, not the owner's handling.

Medication works best as part of a broader plan. Tasipimidine addresses the acute fear event; it doesn't rewrite the underlying association on its own. Veterinary behaviorists typically recommend pairing any anxiolytic with structured desensitization and counterconditioning work, gradually building new emotional associations with the trigger itself. The drug lowers the arousal ceiling enough that the behavioral work can actually take hold.

The morning after the fireworks

For a dog that has spent every Fourth of July shaking under a bed for six hours, Tessie represents a concrete option. A dog that moves through a fireworks night with significantly less distress wakes up less sensitized the next morning.

The period immediately after a fear event is often when dogs are most reactive, hypervigilant, quick to startle and more likely to misread ordinary things as threats. A dog that comes through without that prolonged activation state is better positioned for the behavioral work that follows.

References

[1] "FDA Approves First Drug to Treat Noise Aversion and Separation Anxiety in Dogs." U.S. Food and Drug Administration, May 6, 2026. https://www.fda.gov/animal-veterinary/cvm-updates/fda-approves-first-drug-treat-noise-aversion-and-separation-anxiety-dogs [2] "Orion Animal Health receives US FDA approval for Tessie (tasipimidine oral solution) for the treatment of noise aversion and separation anxiety in dogs." Orion Corporation, May 12, 2026. https://www.orionpharma.com/newsroom/all-news/releases/press-releases/2026/orion-animal-health-receives-us-fda-approval-for-tessie-tasipimidine-oral-solution-for-the-treatment-of-noise-aversion-and-separation-anxiety-in-dogs/ [3] "FDA approves first drug for both noise aversion and separation anxiety in dogs." dvm360. https://www.dvm360.com/view/fda-approves-first-drug-for-both-noise-aversion-and-separation-anxiety-in-dogs [4] "The Veterinary Apothecary: Drug therapies for canine behaviors." dvm360. https://www.dvm360.com/view/the-veterinary-apothecary-drug-therapies-for-canine-behaviors [5] Salonen M, Sulkama S, Mikkola S, et al. Prevalence, comorbidity, and breed differences in canine anxiety in 13,700 Finnish pet dogs. Scientific Reports. 2020;10:2962. https://doi.org/10.1038/s41598-020-59837-z