I had the same problem with my pup and she also did the panacur and had her on a bland diet during the treatment. She gave me a few suggestions on dog foods such as hypo-allergenic foods (trout & sweet potato or venison & sweet potato) I did have her on lamb & rice but switched her to chicken and rice(grain-free) . I had read that some labs have a sensitivity to lamb. Not sure how true that is but she eventually did firm up. Good luck.