I lost my dog to a tumor in his head, in 1985. The bigger the tumor got, he started having trouble walking and functioning. The day he couldn't walk at all anymore, I had a vetinarian come to the house and put him to rest.
I would have done things differently had I had Dr. Hulda Clark 's book back then. I think the relationship she draws between flukes and cancer make terrific sense. If I had my dog now, I would put him on the herbal parasite cleanse right away. Even if your dog gets "wormed" regularly at the vet, they only treat for certain popular parasites. Even if your dog doesn't have cancer, the program might nip other problems in the bud too.
Good luck.