I know this will probably sound pretty weird to most of you but I'm gonna post it anyways.
I went to check on my litter of rats a little while ago and I noticed that one of the babies wasn't really moving around like the rest of them. I picked him up and petted him and rolled him around in my hand trying to get a response from him/her and realized that his back leg was broken. He was also very skinny. He was actually a day younger than the rest of them because I pulled him from a different mom. He opened his eyes on the same day as the rest, but he was SIGNIFICANTLY smaller than the rest of them. I attempted to feed him some milk from a (needleless) syringe and he wouldn't drink any, then I noticed his front leg was broken as well. So I did the whole cervical dislocation bit on him. I cried a bit, and I'm still very upset that I had to do it, I don't even think I did it right because he cried just as I did it and then was still twitching afterwards.
Sometimes I want to sell my snakes so I don't have to breed rats anymore, rehome the cat, and just stick with the dogs. Most people who keep rats as pets don't also feed them to their snakes, but I do love my rats. I just feel like a piece of [poo] for not noticing earlier.