How much trazodone can I give my dog?

The commonly cited veterinary range is 2.5-5 mg/kg (about 1.1-2.3 mg/lb), with some vets going up to 7-8 mg/kg for situational anxiety in dogs who don't respond at the standard dose. Use the Trazodone Dose Calculator for a weight-based estimate, and confirm with your vet before giving it.

How long does trazodone take to work in dogs?

Onset is typically 30-60 minutes, with peak effect around 2 hours after dosing. Most vets recommend giving it 1-2 hours before a known stressful event so it's already active when the trigger starts.

Is trazodone safe for dogs long-term?

It's most commonly used for situational anxiety and short multi-day stretches like post-surgical confinement, rather than as an indefinite daily medication. Longer-term use is possible under veterinary monitoring but is less typical than with drugs like gabapentin.

Can I give my dog trazodone every day?

For short stretches like post-surgical rest, yes, usually dosed every 8-12 hours under a vet's direction. For situational triggers like storms or vet visits, it's more commonly given only when needed.

What are the side effects of trazodone in dogs?

Sedation and mild wobbliness are expected and are the intended effect. Watch for low energy that lasts unusually long, vomiting or loose stool, or, less commonly, agitation instead of calming, which is worth reporting to the vet.

Can dogs overdose on trazodone?

Yes, usually from a dog getting into a full bottle. Watch for tremors, a racing heart, high temperature, or trouble standing, and contact your vet or ASPCA Animal Poison Control (888-426-4435) immediately if this happens.

Can trazodone and gabapentin be given together?

Yes, this is a common combination in vet-behaviorist protocols, especially for noise phobias or heavier sedation needs. They work through different mechanisms, so vets often use lower doses of each together rather than a high dose of either alone. This should be dosed by a vet, not estimated at home.

Is trazodone the same as a sedative like acepromazine?

No. Acepromazine is an older sedative with a different mechanism and narrower safety margin, particularly around blood pressure. Trazodone works on serotonin and is generally considered to have a wider safety margin, which is part of why it's become more commonly prescribed.

Trazodone for Dogs: Dosage Chart & Safety Guide (2026)

What Trazodone Is and Why Vets Prescribe It for Dogs

Trazodone was developed as a human antidepressant in the 1980s. In dogs, it isn't used to treat depression — it's used almost entirely as a short-term anxiolytic and sedative, most often for situational stress: vet visits, groomer appointments, thunderstorms, fireworks, car travel, or the two weeks of enforced rest after orthopedic surgery when a dog needs to stay calm and not tear through their incision.

It's become one of the most-prescribed off-label drugs in general practice over the last decade, largely because it works fast, wears off relatively cleanly, and has a wide safety margin compared to older sedatives like acepromazine.

Trazodone Dosage Chart for Dogs by Weight

The ranges below reflect the dosing most commonly cited in veterinary behavior literature, including protocols published by veterinary behaviorists for post-surgical and situational use. Actual prescriptions vary by purpose, and dogs on other medications need a vet's input before starting.

Dog's Weight	Low-End Dose (2.5 mg/kg)	High-End Dose (5 mg/kg)
10 lbs (4.5 kg)	11 mg	23 mg
20 lbs (9 kg)	23 mg	45 mg
30 lbs (13.6 kg)	34 mg	68 mg
40 lbs (18 kg)	45 mg	90 mg
50 lbs (22.7 kg)	57 mg	113 mg
60 lbs (27 kg)	68 mg	135 mg
70 lbs (31.8 kg)	80 mg	159 mg
80 lbs (36 kg)	90 mg	180 mg
90 lbs (40.8 kg)	102 mg	204 mg
100 lbs (45 kg)	113 mg	225 mg

For situational anxiety, some vets go higher — up to 7-8 mg/kg for dogs who don't respond at the standard dose. That decision belongs to the prescribing vet, not a chart. For your dog's specific weight, the Trazodone Dose Calculator does the conversion instantly.

Timing Matters More Than the Dose

Trazodone needs to be in a dog's system before the stressful event starts, not during it. Most vets recommend giving it 1 to 2 hours before a trigger — a car ride, a storm forecast, a vet appointment — since onset typically takes 30 to 60 minutes and peak effect lands around 2 hours in. Give it too late and you're medicating a dog who's already panicking, which works far less well.

For multi-day use, like post-surgical confinement, it's usually dosed every 8 to 12 hours rather than once.

Common Side Effects

Sedation is the point, so some grogginess is expected and not itself a problem. What to watch for beyond normal drowsiness:

Wobbliness or loss of coordination
Low energy that lasts well past the expected window
Vomiting or loose stool, occasionally
Rarely, the opposite reaction — agitation or restlessness instead of calm (more common in dogs also on other serotonergic drugs)

If a dog seems more agitated on trazodone rather than calmer, that's worth reporting to the vet rather than just pushing through — it can be a sign the drug isn't the right fit, or a sign of an interaction.

Serotonin Syndrome: The One Real Risk

This is the interaction that actually matters. Trazodone increases serotonin activity, and combining it with other serotonin-affecting drugs — certain antidepressants (fluoxetine, sertraline), tramadol, or MAOIs — can push a dog into serotonin syndrome. It's rare, but it's serious: symptoms include agitation, tremors, elevated heart rate, high temperature, and in severe cases seizures.

This is exactly why vets ask about every medication a dog is on before prescribing trazodone, including supplements. If your dog is already on an SSRI for behavioral issues, trazodone isn't automatically off the table, but the vet needs to know and usually adjusts the dose down.

Trazodone and Gabapentin Together

This combination shows up constantly in vet-behaviorist protocols, particularly for dogs with noise phobias or dogs who need heavier sedation for a vet visit than either drug provides alone. They work through different mechanisms — trazodone on serotonin, gabapentin on nerve signaling — so the effects layer rather than just doubling up on the same pathway. Dosing for the combination is lower than either drug's solo dose and should come from the prescribing vet, not from averaging two separate charts. For gabapentin's dosing specifically, see the Gabapentin for Dogs guide.

When to Call the Vet

Contact your vet or ASPCA Animal Poison Control (888-426-4435, 24/7, consultation fee applies) if your dog:

Got into a full bottle rather than a measured dose
Shows tremors, a racing heart, or a high temperature
Seems agitated or restless instead of sedated
Has trouble breathing or can't stand at all

Bring the bottle. Knowing the exact strength and how many pills are unaccounted for changes how urgently the vet needs to act.

Recommended Tools

Trazodone Dose Calculator — Get the exact mg range for your dog's current weight.
Gabapentin Dosage Calculator — For the drug most often paired with trazodone.
Vet Cost Estimator — Budget for the visit where sedation protocols get discussed and adjusted.
Dog BMI Calculator — An accurate current weight is the single biggest factor in getting the dose right.
Pet Insurance Calculator — Useful if ongoing anxiety management is turning into a recurring vet expense.

Before the Next Stressful Event

If you know a trigger is coming — a storm forecast, a flight, a surgery recovery — get your dog's weight confirmed and run it through the calculator a day ahead, not twenty minutes before you need to leave the house.

→ Use the Trazodone Dose Calculator