My sister in-law dumped her dog at my house and never came back for it. What do I do?

Hi, my (27F) partners (33M) sister (30F) dumped her dog at my house last October and never came back, at first my partner and i fought about it. As i said “no, i dont want the dog here” and he said “oh i am trying to help my sister…”, it was a really bad fight that lasted for days (the longest weve ever fought). I just gave up, because i knew i wasn't going to win. As his whole family walks all over me and not one by one, they walk all over me at once. They expect me to take in their unwanted animals, if they dont want their kids for the night they are also dumped at my doorstep. I work all the time and never have time to relax, as they use my house as a daycare, doggy dumping centre and a rubbish dump.

I've tried countless of times to talk to my partner about all of this, but usually he lets his family continue to treat me like trash or just says “omg sthu”. This dog has been at my house for too long, i dont have time for it nor the love i give the pets that are MINE. So mostly the dog is neglected here, his dumpy sister comes over and acts like the dog isn't hers, but ours.

tonight i made a meal for me, my partner and his dad, i took the food down to his dads caravan (he was out for a few hours at the pub) and sat it on the table, i covered the food for him. The dog went missing and my partner couldnt find him, he gave up and i said “i took food down to your dads caravan. Are you sure he didn't go there?” He said “maybe. Ill check” he came back and said “yes, it did. Why did you take it down? Why would you do that? Are you stupid?” I said “you dad told me to and i did? How is it my fault? I didn't want the dog here in the beginning and yous all ignored me and told me to ‘shut up’ and its my fault?” I want to talk to him about the dog again (his currently gaming) but i dont know what to say, what do i say? I want the dog gone, we are always out of money, cause his dumpy sister doesn't help us and now we are stuck with the cursed thing. Im so exhausted 😩

My sister in-law dumped her dog at my house and never came back for it. What do I do?
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