@WhiteJasmin maybe pregnancy hormones? I think I’m pretty laid back in general, so personally this wouldn’t annoy me, but doesn’t mean that you shouldn’t be.
he has given you quite a lot of notice to find someone new, and if he’s telling the truth about it being the only time he can take a holiday then I personally wouldn’t want my brother not to get a holiday to look after my dogs.
I hate depending on others, especially friends and family as it can just lead to arguments or begrudgement, so I’d always prefer to book my dogs into a kennel when the time comes, or book a pet sitter.
I know it’s annoying when you do so much for others and it isn’t reciprocated (I do the same), but I’m happier and my conscience is clear when I go out of my way to help others, it gets me down when I don’t get it back but I just have to tell myself I’m not doing it for the return favours.
Again, just because it wouldn’t annoy me, it’s not to say it shouldn’t annoy you ☺️ (if he did this in October I would be annoyed).