Rain....unless he is going on a walk and then rain is fine.

So it's pouring, and Murphy has to pee. Open the backdoor and he takes one step out, stops and comes back in. He's like, "yo, you expect me to go out and pee in that wet ass shit? Don't play, bro. Don't play." We argue, and eventually he goes outside and pees and runs back in. This is all fine. I understand not wanting to get wet, but this only happens in the back yard. When it rains and I take him on a walk. Zero fucks are given. He's all like, "Let's do this! where are those bitch ass squirrels? how many trees can I pee on? All Of them?! Challenge accepted."