My dog Annie is a 7 yr old part Damatian who we got my the SPCA. She was fine up until last year when she started throwing up. The vet couldn't seem to find anything wrong with her and gave her all the shots including the lyme disease shot. I recently took her to another vet because she still throws up, licks her butt, sometimes skids her butt, and has lost a considerable amount of weight. The second vet said she had whip worms and gave her medication. She is still losing weight, throwing up and skidding. What do we do, I don't want to lose her. What should I feed her and should I take her to another vet. Please help, Cynthia Clark