Dosage Guide • FL · NY · VA • Reviewed by Dr. Tiffany Delacruz, DVM
Trazodone Dosage for a 20 lb Dog
trazodone · Serotonin antagonist and reuptake inhibitor (SARI) · Small breed (20 lb / 9 kg)
What pet owners in Florida, New York, and Virginia need to know about Trazodone dosing for a 20 lb (Beagles-sized) dog — written by a licensed vet, no specific dose given without an exam.
The dosing principle for Trazodone
Trazodone in dogs is typically dosed at approximately 2-10 mg/kg per dose, given 1-3 times daily as needed for situational anxiety, or daily for chronic anxiety. The wide range exists because individual dog response varies significantly — vets often start low and titrate up.
Trazodone has a wide therapeutic window but individual dogs vary in their response. Some dogs are highly sensitive and need only the low end of the range; others need higher doses for any noticeable effect. Vets often do a 'test dose' a week before a stressful event (storm, vet visit) to find the right dose. Dosing also adjusts for liver function and concurrent medications.
Why 20 lb matters
A 20 lb (9 kg) dog falls into the small category — typical examples include Beagles, Cavalier King Charles Spaniels, Pugs, and Boston Terriers.
Small breeds in this weight range are common pet sizes, but breed-specific predispositions (e.g., Pug airway issues, Cavalier heart disease) can affect drug choice and dosing. A breed-aware vet is especially valuable for these dogs.
What Trazodone is approved for
- Situational anxiety (vet visits, thunderstorms, fireworks)
- Post-surgical confinement calming
- Travel anxiety
- Generalized anxiety (often paired with daily SSRI or TCA)
What to watch for in your 20 lb dog
- Excessive sedation — the goal is calm, not unconscious
- Wobbliness, especially first dose
- Paradoxical agitation (rare but report immediately)
- Vomiting (uncommon)
- Serotonin syndrome if combined with other serotonin-affecting drugs (SSRIs, MAOIs, certain pain meds) — never combine without vet guidance
Get a Trazodone prescription or refill in your state
RexVet is licensed in Florida, New York, and Virginia. Our veterinarians can examine your 20 lb dog by video, calculate the right Trazodone dose for their specific situation, and either fill the prescription through our in-house pharmacy or send it to a local pharmacy near you.
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Virginia
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Frequently asked questions
Frequently asked questions
How much Trazodone can I give my 20 lb dog?
Trazodone in dogs is typically dosed at approximately 2-10 mg/kg per dose, given 1-3 times daily as needed for situational anxiety, or daily for chronic anxiety. The wide range exists because individual dog response varies significantly — vets often start low and titrate up. For a 20 lb (9 kg) dog, this gives a range that a licensed vet will narrow down based on the indication, your dog's age, kidney/liver function, and any other medications. RexVet vets serve Florida, New York, and Virginia and can calculate the right dose for your specific dog in a $64.99 video visit.
Is Trazodone safe for a small dog like mine?
Trazodone (trazodone) is widely used in dogs in the 20 lb range, but "safe" depends on the specific dog, not just the weight. Small breeds in this weight range are common pet sizes, but breed-specific predispositions (e.g., Pug airway issues, Cavalier heart disease) can affect drug choice and dosing. A breed-aware vet is especially valuable for these dogs. A licensed vet will check your dog's history, current medications, and any underlying conditions before prescribing.
What should I watch for after giving my 20 lb dog Trazodone?
The most common things to watch for are: Excessive sedation — the goal is calm, not unconscious; Wobbliness, especially first dose; Paradoxical agitation (rare but report immediately). If you see anything concerning, contact a vet. For small dogs specifically: Small breeds in this weight range are common pet sizes, but breed-specific predispositions (e.g., Pug airway issues, Cavalier heart disease) can affect drug choice and dosing.
Can a RexVet online vet prescribe Trazodone for my 20 lb dog?
Yes — if your dog is in Florida, New York, or Virginia and the medical situation is appropriate. Trazodone is one of the medications RexVet's licensed veterinarians can prescribe via a $64.99 video visit. The vet will examine your dog by video, ask about history, and either prescribe Trazodone at the right dose for your dog's weight (20 lb) or recommend a different approach if needed.
Can I get a Trazodone refill in Florida, New York, or Virginia online?
Yes. RexVet is licensed in all three states and can refill Trazodone prescriptions for dogs already established on the medication. Refill visits are also $64.99. Prescriptions are filled through RexVet's in-house pharmacy (RexVetRx) or can be sent to your local pharmacy. Same-day delivery is available in most ZIP codes in FL, NY, and VA.
Trazodone dosing for other dog weights
Other medications dosed for a 20 lb dog
Sources
Last fact-checked: 2026-06-01. Reviewed by Dr. Tiffany Delacruz, DVM. RexVet (Rex Vets Inc.) is licensed in Florida, New York, and Virginia.
Get the right Trazodone dose for your 20 lb dog
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