FL · NY · VA • Reviewed by Dr. Tiffany Delacruz, DVM

Pet Medication Dosage Guides

Dosage guidance for common dog medications by weight — written for pet owners in Florida, New York, and Virginia. Each guide explains the dosing principle and routes you to a licensed vet who can calculate the right dose for your dog.

Talk to a vet — $64.99 Find your dog's dose

Important: These pages explain the principles behind dosing — they do not give a specific dose for your dog. The right dose depends on your dog's individual age, organ function, current medications, and condition. A licensed Florida, New York, or Virginia veterinarian can calculate the right dose for your dog in a $64.99 RexVet video visit.

Find your dog's medication

Pick your medication, then your pet's weight class.

Dogs (36 guides) Cats (20 guides)

Dogs

Medication	10 lb Toy	20 lb Small	30 lb Small	50 lb Medium	70 lb Large	100 lb Giant
Carprofen carprofen	View →	View →	View →	View →	View →	View →
Gabapentin gabapentin	View →	View →	View →	View →	View →	View →
Benadryl diphenhydramine	View →	View →	View →	View →	View →	View →
Prednisone prednisone	View →	View →	View →	View →	View →	View →
Apoquel oclacitinib	View →	View →	View →	View →	View →	View →
Trazodone trazodone	View →	View →	View →	View →	View →	View →

Cats

Medication	5 lb Kitten	8 lb Small adult	12 lb Medium adult	18 lb Large adult
Gabapentin gabapentin	View →	View →	View →	View →
Cerenia maropitant	View →	View →	View →	View →
Mirataz mirtazapine	View →	View →	View →	View →
Prednisolone prednisolone	View →	View →	View →	View →
Solensia frunevetmab	View →	View →	View →	View →

Browse by medication

Each link goes to the dosage guide for that medication at the most common dog weight (50 lb). From there you can pick any other weight class.

Carprofen Dosage

carprofen · Non-steroidal anti-inflammatory drug (NSAID)

Carprofen is metabolized by the liver and cleared by the kidneys.

View dosage guides →

Gabapentin Dosage

gabapentin · Anticonvulsant / nerve-pain modulator

Gabapentin has a very wide therapeutic window — dogs tolerate a broad dose range.

View dosage guides →

Benadryl Dosage

diphenhydramine · First-generation antihistamine

Plain diphenhydramine is generally safe at the labeled range, but combination products are not.

View dosage guides →

Prednisone Dosage

prednisone · Corticosteroid

Prednisone has powerful effects and equally powerful side effects.

View dosage guides →

Apoquel Dosage

oclacitinib · Janus kinase (JAK) inhibitor

Apoquel is highly weight-dependent because it comes in discrete tablet strengths.

View dosage guides →

Trazodone Dosage

trazodone · Serotonin antagonist and reuptake inhibitor (SARI)

Trazodone has a wide therapeutic window but individual dogs vary in their response.

View dosage guides →

Frequently asked questions

How much medication can I give my dog by weight?

Dosing depends on the specific drug, the indication being treated, your dog's age, kidney and liver function, and other medications they may be on. For example, carprofen is typically 2 mg per pound per day, gabapentin ranges 5-30 mg/kg per dose, and diphenhydramine (Benadryl) is approximately 1 mg per pound every 8-12 hours. Each guide on this hub explains the principle behind the dose and the FDA-labeled range — but the actual dose for your specific dog needs to come from a licensed veterinarian.

Why don't these pages give me a specific dose?

Because giving a specific dose without examining your pet would be practicing veterinary medicine without a license — and unsafe. The right dose for your dog or cat depends on factors only a vet can verify: weight, age, organ function (bloodwork), other medications, breed-specific drug sensitivities (like MDR1 in herding breeds), and the specific condition being treated. RexVet's licensed Florida, New York, and Virginia veterinarians can calculate the right dose for your pet in a $64.99 video visit.

Can I get a prescription dose from a RexVet online vet?

Yes — RexVet veterinarians are licensed in Florida, New York, and Virginia, and can issue prescriptions for established and new patients. After a $64.99 video visit, prescriptions are filled through RexVet's in-house pharmacy (RexVetRx) with same-day delivery in most ZIP codes, or sent to any local pharmacy.

Which medications are covered in these dosage guides?

Dog dosage guides cover Carprofen, Gabapentin, Benadryl (diphenhydramine), Prednisone, Apoquel, and Trazodone across 6 weight classes (10/20/30/50/70/100 lb). Cat dosage guides cover Gabapentin, Cerenia (maropitant), Mirataz (mirtazapine), Prednisolone, and Solensia (frunevetmab) across 4 weight classes (5/8/12/18 lb).

When was this hub last reviewed?

Last reviewed 2026-06-03 by Dr. Tiffany Delacruz, DVM. Content cites FDA drug labels, the Merck Veterinary Manual, ACVIM consensus statements, and AAHA/AAFP guidelines.

Last reviewed: 2026-06-03 by Dr. Tiffany Delacruz, DVM.