Take your dog to the vet NOW. It is toxic in that amount.
If you need to call someone here is a free hotline, PLEASE CALL IF YOU CAN'T SEE THE VET!!! It is free!!!
Kansas State University Veterinary Teaching Hospital is offering a FREE 24 hours poison control hotline for pet owners and veterinarians.(785)532-5679 is the number and the service has been available since 1969. Dr Oehme, a vet and professor in toxicology and pathology oversees the hotline. Dr Oehme offers these suggestions:
Be patient. The person answering the phone may have to take a few minutes to consult the vet on duty.
Call as soon as possible. Immediate attention might save your animal. But waiting to see if there is a reaction could cost your animal their life.
Have any product labels available for answers. The vet might need to know milligrams and generic names.
Know that the toxicologists are also taking calls from vets about other animals and other problems, including those problems with large animals.