Hi, Shadow seems to have constipation. He tries to go but nothing comes out. This has only been happening today, yesterday he went fine. I did a search and found some of the suggestions and was going to try the canned pumpkin. I just had some follow up questions, how much should I give him? How long should it take to help out? I think I know the cause, we've been switching him to half raw/half kibble, we've been doing it very very slowly and he seems to have no problem with turkey or chicken, but today was the first beef day. Im thinking I should switch back to chicken tomorrow since I know some dogs dont do well on some kinds of meat. Thanks for any advice!