<human>: I have a 6 y o dog.  Put my older dog down this summer.  I took in fiancé 15 y o dog 3 years ago.  She likes other dogs.  He wasnt home much.  So I had 3 dogs and now I have 2.  Only 1 is mine.

After my older dog was diagnosed with cancer, I dealt with puke and shit up the bajeezers until we put him down.  Since then, the other dogs have taken to occasionally using the carpet as their bathroom.  Even after being outside.

admittedly, my dog is just as bad as my fiancé's dog.  But last two weeks, his dog has gotten sick.  Vile smelling shit two feet away from my nose as I sleep.  Four times in two weeks.

I think I can retrain my dog easier if she is not here.

She is old, deaf and doesn't like to be pet or hugged or played with.  Basically a walking shit bag to me.

He agreed to take her for the weekend to give me a break.  But come Monday, he has a ten hour movie marathon to go to with a friend and she will be back with me.

I just want her gone.  From my home...
There is NO reason for her to be here as his work hours have changed.  She no longer cares for my busy household.  Now, she's so old, she just sleeps.  Or shits the house.  She clearly doesn't care for the people in my house.

On the flip side, my fiancé stays at my house when I'm on vaca and watches our dogs.  Saving me $100s.

How do I put my foot down that I don't want her here without sounding like a bitch?

Condense the text into a few key points
<bot>: fiancé has his deaf, old dog live with me.  She's a pain.  I don't want her here any more.  How do I be firm with "you keep your dog"? I'm done.