Hey guys, the title doesn't say much because my new kitten has a weird and a bit gross health issue. His bum seems to be open sometimes. I've only had him for a few days but sometimes I notice a poop smell. I checked his bum to see what was happening and it looks like his bum doesn't close properly. It looks about half open and seems to be lightly twitching. It will stay like this for maybe a minute? It's very hard to tell since he's so active and won't sit still long enough for me to see. It doesn't look sore or anything, just open. Most of the time his bum looks normal (closed), but quite a few times a day it will be open. It's very weird and a bit disturbing. A bit of background: he is probably around 6 months old. I took him over from someone at work who was already bored of him and wanted to get rid of him. He lived with another cat and a big dog. He was not vaccinated. I was thinking it could be worms/parasites? I went to the pharmacy and got him some deworming pills that I gave to him yesterday. I have no idea how fast it should take effect if it is parasites. His stool was a bit softer than what I think it should be but generally ok. I have given him some milk so it might be that? I've stopped in any case because he doesn't really like it. His urine smells incredibly strong. I have had cats all my life and I've never smelled anything this strong. His breath is also really smelly. I got him vaccinated the day I got him. He is in great shape otherwise. He is constantly running around and playing. He seems to be eating well (a bit less than I expected but enough). He's supposed to go back for the second round of vaccines and sterilization at beginning of March. Is the open bum something I should worry about? Should I wait until I'm going back with him to the vet or should I go back sooner? I would really appreciate some help with this.