Awesome! I'll go test it now. Even if it doesn't work, thanks for the effort. I really just didn't want to set up an IDE and everything for one tiny mod.
Edit:// So I loaded up a save with some animals, and it seems to be working. It shows the heart above the animal, the pet indicator from UI Info Suite disappears, and it collects all the items from the animals. It seems like the audio for the petting gets cut short which I'll miss, but the important thing is, the core functions of the mod seem to be working. I tried cheating and adding an "auto-petter" machine, which is apparently new to 1.5, but couldn't really tell if it did anything or not. It's just not the same without animal sitter. So thanks again!
And for people waiting on auto animal doors, after doing a bit of research, there doesn't appear to be any penalty for leaving the doors open all night. It seems mostly just a means of keeping the animals corralled for easy petting/milking/shearing. I've seen a few people claim that animals might disappear (presumably eaten by wolves), though it seems exceedingly rare, and think that may only apply to if you're playing the forest map. In 1.5 when starting a new game you can enable/disable wild animal attacks. So as long as you have animal sitter, auto animal doors isn't really necessary. Just close the doors the last day of fall and open them again the first day of spring, otherwise leave them open.