Dosage Guide • FL · NY · VA • Reviewed by Dr. Tiffany Delacruz, DVM
Trazodone Dosage for a 100 lb Dog
trazodone · Serotonin antagonist and reuptake inhibitor (SARI) · Giant breed (100 lb / 45 kg)
What pet owners in Florida, New York, and Virginia need to know about Trazodone dosing for a 100 lb (Great Danes-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 100 lb matters
A 100 lb (45 kg) dog falls into the giant category — typical examples include Great Danes, Mastiffs, Saint Bernards, and giant mixed breeds.
Giant breeds have unique drug-metabolism considerations — they're not simply 'big small dogs.' They often need proportionally lower doses per kg than smaller dogs. Anesthesia, NSAIDs, and sedatives all need experienced veterinary calibration. Bloat (GDV) risk also affects which oral medications can be used safely.
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 100 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 100 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 100 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 100 lb (45 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 giant dog like mine?
Trazodone (trazodone) is widely used in dogs in the 100 lb range, but "safe" depends on the specific dog, not just the weight. Giant breeds have unique drug-metabolism considerations — they're not simply 'big small dogs.' They often need proportionally lower doses per kg than smaller dogs. Anesthesia, NSAIDs, and sedatives all need experienced veterinary calibration. Bloat (GDV) risk also affects which oral medications can be used safely. 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 100 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 giant dogs specifically: Giant breeds have unique drug-metabolism considerations — they're not simply 'big small dogs.' They often need proportionally lower doses per kg than smaller dogs.
Can a RexVet online vet prescribe Trazodone for my 100 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 (100 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 100 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 100 lb dog
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