Is it normal to end a relationship over my gf's pets?

Yeah, sounds like the pets are just highlighting some bigger problems in the relationship...like how you two divvy up finances and household chores, whether or not your lifestyle habits match up. Sounds like you might have some bigger problems to deal with. You'll have to decide whether it's worth hashing out at this point (and if so, you'll have to have a long talk), or if you just want to call it quits.

It seems she's shit testing you and you are failing.

"even got stuck buying their litter and food" oh, oh god, how humiliating.

Time to start lifting, grow them balls, tell the ladies ALL animals have to go, NO COMPROMISE or you're out the door. Say it and mean it, if they choose to take the animals, they'll respect you as a man thus reversing the shit you allowed for so long. Theoretically.

Pets aren't for everybody. Sometimes, if you are the one taking care of someone else's animal, that can lead to a very big problem, especially if you are in a relationship. I guess you need to be straight with the girl, and tell her like it is. Either the pets go, or you go. Tell her your living arrangement is not very fair. She should be taking care of the animals, not you. Best of luck to you in sorting things out. I am sure you don't wanna end a 5 year relationship. Talk to her and straighten her out.

I meant if him or her does tell him or her that they're taking full responsibility of things him or her don't like then... Give him or her the smack down..... Hehehe sorry type to fast

Dude or girl, if a girl or guy can have pets and a gf or bf and they don't care about the pets or the fact that their partner doesn't like them and takes care of them but she or he won't tell him or her hey ur pets are being cared for by me and if u don't start helping out I'm leavening I can't take full responsibility over something that is all yours and she gets that one chance! If she says she'll help and does for a while then stops or doesn't at all pack up ur stuff and move and leave a note on the fridge or kitchen counter or leave her high and dry u shouldnt be considerate if she can't beL hope it helps I just want to let u know u need to put ur foot down or shell keep using you as er responsibility haver where u take responsibility so she don't have to!

I love the warm and furries as much as the next guy, but they have to be able to live with me without making my life a nightmare. If a pet makes more mess than I can live with, especially when I know it knows better, them one of us has to go.
However, something like a cat throwing up around the flat, would indicate an ill cat and this problem might be solved by a trip to the vet. Mommy should find another place to board her pet several days a week, I should think.
Even without being a clean freak,what you have described would be an unacceptable way to live, for me, too. Time to put your foot down and tell your girl exactly how you feel.