I have a 6 month old lab/ australian shepherd mix. Yesterday morning she had a normal bowel movement without any problems. That evening she tried to go and could only get a little out, because it was hurting her so much. She was yelling so much I decided to take her to the vet. They said that she was probably just a little constipated and gave her lactulose to help loosen everything up and cerenia to help with any pain or nausea. This morning she seemed to be in even more pain when trying to defecate. Howling, running around, and drooling. I took her to the vet again and they observed that her anus was a little red and swollen and that her stool was sandy. They believed this was causing irritation when trying to pass solids. The upped the dose of lactulose and gave her an anti inflammatory. That being said, they couldn?t really give me any reasoning as to why the stool was sandy other than she ate possibly ate sand or it could have been how her body reacted to the larger bone I bought her for the first time yesterday. My question is, has anyone else experienced this kind of reaction to your dog eating a larger bone?