Adult dogs should take one pill of vitamin E a day, and dogs under one year old should take half a pill a day. Breeders should choose pet-specific vitamin E to supplement the dogs, and feed the dogs with human vitamin E to absorb. No. The lack of vitamin E in dogs will affect the body's muscles, cause muscle atrophy, and reduce the body's liver function. In severe cases, it can also lead to reduced fertility and the inability to reproduce offspring.