I have a recently adopted fat cat, his previous owner said he is prone to constipation and to feed him hartz hairball remedy if he doesn't have a bowel movement in 24 hours and that usually makes him go. She said that once he needed an enima. The last week I noticed his poops were looking really small and hard, then he just stopped pooping all together. I quit feeding him dry grain and started strictly feeding him canned wet food. It has been 3 days and no bowel movement. Once I tried mixing pure plain canned pumpkin into his wet food (to help him poop) but it made him throw up, so I don't want to try that again. I try feed him the hartz hairball remedy but he hates it SO MUCH and I have to force feed it to him then he scratches and bites and hates me, and usually manages to just spit it all out. I am planning on taking him to the vet tomorrow but......... I don't know why he is so constipated? has anyone else had this problem?