VETERINARY USE ONLY: THIS TOOL IS FOR INFORMATIONAL MATH. ALWAYS CONFIRM DOSAGES WITH A LICENSED VETERINARIAN.
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Veterinary Dosage Portal

Instant weight-based math for common pet medications. From Gabapentin to Amoxicillin, find the precise dose for dogs, cats, and small animals.

Estimated Range
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*Based on mg/kg rule

Understanding Veterinary Weight-Based Dosing

Most veterinary medications are prescribed using a mg/kg (milligrams per kilogram) formula. This ensures that a 5lb Chihuahua and a 150lb Great Dane receive a proportional dose relative to their metabolic body weight.

The Golden Formula

Weight (kg) ร— Dose (mg/kg) = Total Dose (mg)

To get weight in KG from LB, divide the weight in LB by 2.20462.

Safety Thresholds

Always check the maximum daily limit (mg/day) which often differs from the per-dose calculation.

Warning: Liver & Kidney filtration rates vary.

Frequently Asked Questions

No. Human pain medications like Acetaminophen (Tylenol) and Ibuprofen can be highly toxic or even fatal to dogs and cats. Always use vet-prescribed NSAIDs like Carprofen.
Use a 1mL oral syringe for precise measurements. Our calculators provide rounding to the nearest 0.1mL to match standard syringe markings.

Dosage Safety

  • Always use the original measuring device provided by the manufacturer or vet.

  • Confirm the exact concentration (mg/mL) printed on the bottle.

  • Check for food interaction requirements (e.g., 'give with meal').

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VetReferencing MedLogic PetHealthAPI DoseData

Common Pet Medication Reference

Standard OTC guidelines. NEVER give Tylenol or Ibuprofen to cats.

Animal / Weight Benadryl (Diphenhydramine) Zyrtec (Cetirizine)
Dog (10 lbs) 10 - 20 mg 5 mg
Dog (25 lbs) 25 - 50 mg 10 mg
Dog (50 lbs) 50 - 100 mg 10 mg
Cat (Any Size) CONSULT VET (Dosing varies) CONSULT VET
!
Critical Toxicity Warning: Many human foods and drugs are fatal to pets. Avoid: Grapes, Raisins, Chocolate, Xylitol (Gum), Ibuprofen, Acetaminophen.
Clinical Review
Dr. Igor I. Bussel
Dr. Igor I. Bussel, MD
Board-Certified Ophthalmologist

Dr. Igor I. Bussel is a board-certified ophthalmologist and fellowship-trained surgeon affiliated with the University of California, Irvine (UCI), the Gavin Herbert Eye Institute, and the UCI School of Medicine.

Last Updated: January 2026
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