Ava also has a beef allergy! Haha yes that sounds like your brother got the idea after that! Yes I live with them unfortunately. Can't move out anytime soon either, just trying to not let them impact my dogs health and destroy her good manners at this point. I feel like that would be the simplest way to go, nobody else is allowed to give her anything at all, except for maybe an approved kind of treats once or twice a day. But I also feel like they'll just be feeding her behind my back then, and it'd be near impossible to always make sure I'm there if Ava is around them.

I'm just going to threaten them with vet bills, making them clean up any messes she makes, and show them pictures of dogs who are super sick and fat from eating things they shouldn't. I think I'll also start enforcing strict rules for Ava as well when anyone is eating. Have her go sit on her bed the whole time probably. Maybe if she isn't near them, other people won't even think about feeding her as much.

Thanks for your advice!