Published dose range
Published guidance for dogs: small: 250 mcg; medium: 500 mcg; large: 1000 mcg daily, every 24h.
Source: Veterinary Partner (VIN) →Water-soluble, wide safety margin. GI-disease dogs often need vet-administered injections instead, oral absorption is the problem being treated.
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.