Dose
50 mg
Frequency
Every 8–12 hours
Form
Tablet
Veterinary Disclaimer
Always consult your veterinarian before giving any medication to your pet. This calculator provides general guidelines only and is not a substitute for professional veterinary advice. Dosages may vary based on your pet’s health conditions and other medications.
Always Consult Your Veterinarian
These are general OTC guidelines. Your pet’s specific health conditions, other medications, and individual sensitivities may require different dosages. When in doubt, call your vet first.
Dose per Administration
50 mg
Benadryl (Diphenhydramine)
Tablets
2.0
Daily Total
150 mg
Inputs
Result
A 50-lb dog gets 1 mg/lb = 50 mg per dose. That is two standard 25-mg tablets, up to 3 times daily for a maximum of 150 mg per day.
Inputs
Result
A 30-lb dog gets 1 tsp per 10 lbs = 3 tsp (15 ml) per dose. Can be repeated every 6–8 hours, up to 4 times per day maximum.
Inputs
Result
A 10-lb cat needs 20 mg/lb = 200 mg EPA+DHA daily. About 2/3 of a standard 300-mg fish oil capsule, mixed into food once daily.
The standard Benadryl dosage for dogs is 1 mg per pound of body weight, given 2-3 times daily. A 50-pound dog gets 50 mg (two 25-mg tablets). Use only plain diphenhydramine — never combination products like Benadryl-D that contain pseudoephedrine.
| Dog Weight | Dose (mg) | Tablets (25mg) | Liquid (12.5mg/5ml) |
|---|---|---|---|
| 10 lbs | 10 mg | 0.5 tablet | 4 ml |
| 25 lbs | 25 mg | 1 tablet | 10 ml |
| 50 lbs | 50 mg | 2 tablets | 20 ml |
| 75 lbs | 75 mg | 3 tablets | 30 ml |
Yes, Benadryl (diphenhydramine) is generally safe for cats at 1 mg per pound, given up to twice daily. A 10-pound cat gets 10 mg. Cats often drool excessively when given liquid Benadryl — this is a taste reaction, not an allergic response.
Pepto-Bismol can be given to dogs at 1 teaspoon per 10 pounds of body weight, every 6-8 hours. It is NOT safe for cats — it contains salicylate (aspirin-like compound) that can cause toxicity in felines. Stool may turn dark, which is normal.
The recommended fish oil dose is 20 mg of combined EPA+DHA per pound of body weight daily. A 50-pound dog needs about 1,000 mg EPA+DHA, roughly 3 standard fish oil capsules (300 mg each). Start with half the dose for the first week.
ONLY use hydrogen peroxide (3%) to induce vomiting when directed by a veterinarian or poison control. The dose is 1 teaspoon per 10 pounds, maximum 3 tablespoons. Never induce vomiting for caustic substances, sharp objects, or petroleum products.
Discover more calculators for dogs, cats, and other pets.
Last Updated: Mar 9, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.