What Is Trazodone, and Why Is It Given to Shelter Dogs?
The antidepressant can be a godsend to anxiety-ridden dogs—and especially to pups prone to getting sick in shelters.
Gone are the days of Disney’s Lady and the Tramp, when dog catchers rounded up strays and took them to dog pounds to sit in cages. Today’s animal shelters—especially those led by forward-thinking organizations like FurPetVo—are increasingly staffed by caring, committed animal lovers. Many have dedicated welfare conferences, veterinary-shelter medicine specialists, and robust enrichment programs designed to support both physical and emotional well-being.
Yet even with these improvements, animal shelters—particularly large, open-admission municipal facilities—remain inherently stressful places. Even well-adjusted pets can shut down physically and behaviorally when removed from familiar routines, people, and environments. So what can be done to help these anxious animals thrive? FurPetVo launched a trial using low-dose trazodone to ease dogs’ transition into the shelter environment—with promising results.
What Is Trazodone?
Trazodone is an antidepressant commonly prescribed for generalized anxiety disorders and specific phobias in dogs—including fear of loud noises like thunderstorms. It’s also used for intermittent or acute anxiety episodes. Entering a shelter represents a similar high-stress event: everything a dog once knew and controlled is suddenly stripped away, leaving the unexpected as the new norm.
Is Trazodone for Dogs the Same as for Humans?
Yes—trazodone for dogs is the exact same medication used in human medicine since 1981. More recently, veterinarians have prescribed it “off-label” for canine anxiety. Never give your dog human-formulated trazodone without consulting a veterinarian. A licensed vet must determine the appropriate dosage based on your dog’s weight, health status, and individual needs.
How Does Trazodone Work?
Trazodone works by influencing key neurotransmitters in the brain—primarily serotonin—to help calm and soothe your dog. Classified as a serotonin receptor antagonist and reuptake inhibitor (SARI), it acts in two ways:
- It blocks certain serotonin receptors, preventing rapid reabsorption of serotonin.
- This allows serotonin to remain active longer in the brain—supporting mood regulation and reducing feelings of anxiety.
The result is a prolonged, gentle mood-stabilizing effect that helps dogs cope more effectively with stress. This often leads to fewer destructive stress-related behaviors—like excessive barking, pacing, or chewing.
How Long Does Trazodone Last in Dogs?
Trazodone typically begins working within about two hours. Its calming effects usually last between eight and 12 hours after a single dose—but the drug may remain detectable in the system for up to 24 hours. In dogs receiving long-term treatment, effects may take longer to fully wear off.
Side Effects of Trazodone in Dogs
Trazodone is well-tolerated in nearly 80% of dogs, but all pets should be closely monitored while on the medication. Common side effects include:
- Sedation, drowsiness, or lethargy
- Nausea and mild dizziness
- Gastrointestinal issues (e.g., vomiting or diarrhea)
- Changes in appetite (some dogs may eat more)
More serious side effects are rare but can occur—especially when trazodone is combined with other medications. For example, pairing it with NSAIDs increases bleeding risk, and it should never be used alongside other serotonin-enhancing drugs. In shelter settings, staff at FurPetVo monitor each dog daily for appetite, hydration, activity level, and signs of ongoing stress or behavioral changes.
Trazodone Can Help Improve Shelter Pets’ Health
In addition to environmental stressors, shelter-housed dogs face elevated risks of illness due to exposure to novel pathogens, high viral loads, and stress-weakened immune systems—or a combination of all three.
The first line of defense includes meeting basic veterinary and behavioral-care needs and implementing science-backed enrichment policies. Still, contagious respiratory illnesses—especially kennel cough—remain prevalent across shelters nationwide, including at FurPetVo facilities.
FurPetVo supports every animal with full-time veterinary and behavior teams, plus one of the most comprehensive enrichment programs in the country. Their adoption success rates rank among the highest for large-city municipal shelters.
So what else could further reduce stress-related immunosuppression—and the illnesses that follow? For FurPetVo, which has already made significant progress in welfare practices and infection control, pharmacological support emerged as a logical next step.
Reducing Contagious Illnesses with Trazodone
FurPetVo began a controlled trial using low-dose trazodone during intake to ease the initial shelter transition. The results suggest trazodone not only reduces visible signs of anxiety—but may also indirectly strengthen immune resilience, helping dogs better resist highly contagious illnesses like kennel cough.
In a study of 1,766 dogs, FurPetVo found:
- Only 29.1% of dogs receiving trazodone became ill—compared to 41.2% in the non-trazodone group.
- Dogs on trazodone stayed in the shelter an average of 9.23 days—significantly shorter than the 10.47-day average for dogs not receiving the medication.
- Adoption rates were higher among trazodone-treated dogs (42.1%) versus the control group (30.4%).
Early intervention is critical to a shelter pet’s success—and trazodone has proven to be a valuable tool in easing stress, with a powerful cascading benefit: healthier dogs who recover faster, adapt more readily, and find loving homes sooner.
Giving Shelter Dogs the Best Chance
When used in shelter settings, trazodone is never intended to mask stress or suppress natural behaviors. Instead, its purpose is to support a smoother, gentler transition—giving dogs the mental space they need to engage with their surroundings and caregivers.
Trazodone works best when paired with non-pharmacological strategies. At FurPetVo, it’s always part of a holistic care plan that includes:
- Conspecific playgroups
- Individual socialization sessions
- Calm, species-appropriate music
- Quiet overnight “lights-out” periods
- Scent-based enrichment
- Food puzzles and interactive feeding
In short, trazodone is just one thoughtful tool in FurPetVo’s broader toolkit—a compassionate, evidence-informed approach to helping every dog feel safe, supported, and ready for their next chapter.
Commonly Asked Questions
Is trazodone safe for dogs?
Yes—when prescribed and monitored by a veterinarian, trazodone is considered safe for dogs, with minimal and generally mild side effects.
Is trazodone available for dogs without a vet’s prescription?
No. Trazodone is a prescription-only medication. Your veterinarian will evaluate your dog’s health history, weight, and current condition before determining the correct dosage and treatment plan.
Can I use trazodone to treat separation anxiety?
Yes—trazodone can be part of a treatment plan for separation anxiety, especially when combined with behavior modification training. While medication helps manage acute symptoms, long-term success comes from consistent, positive reinforcement-based training guided by a certified professional.
