After administering the 2nd dosage of Hartz tick and flea drops, we noticed a significant change in our 10 year old terrier, Bingo. He became lethargic, experieced loss of appetite and wobbly on his feet. Our vet was not concerned about the Hartz product but deterioration continued. Finally, last week his weight loss and dehydration were so significant that he was administered fluids and a scope was performed. His intestines are on fire. After the fluids and antibiotics, he seems to have improved. The blood in his stools has disappeared. What else can we be doing? Diet? Homeopathic? Herbal? Thanks so much!