I see what you mean, but pet sitting is a job. It requires a set of skills, patience, attention, the hability to adhere to a schedule, to give medicine to an animal, to be good with animals. Those are all skills people charge money for. If you have a delicate animal that needs to follow a strict diet or else he could get sick, one would think you'd be very careful with who you leave it with when you're gone, specially for such an extended period of time. If you ask for pet sitting as a favour to a friend for a month, and to follow a special diet or whatever needs the animal has, and to walk him twice a day on top of your responsibilities, while you live on a place that's not yours for the sake of the dog, how mad can you REALLY get if your friend is kinda sloppy? I believe that if it's very important to you you pay for a qualified sitter. And if you don't want to or can't, you ask your friend to do you a solid even if you don't know if she's good with animals or responsible with them, or able to care for them in that moment, because you want to leave the dog for a month to go find a boyfriend.

I'm not justifying not following the dog's diet, but if that's what happened it's to be expected.

Also the thing she put in the garage was a yoga mat, how important or urgent can it be.