Published dose range
Published guidance for dogs: one 11.4 mg tablet (2-25 lb) or 57 mg tablet (over 25 lb), once daily as needed.
Source: Merck Veterinary Manual →Kills adult fleas within hours, zero residual, pair with a monthly preventive. Safe from 4 weeks age / 2 lb.
Skip it or ask a vet first if
under 2 lb / 4 weeks old
If you think you overdosed
Call the Pet Poison Helpline: 855-764-7661 or ASPCA Poison Control: 888-426-4435. Both are staffed 24/7 by veterinary toxicologists.