Is NOBODY wrong in the post ? POST : Throwaway, etc, etc. I understand that this question already sounds bad, but I'd like to explain a little and see if I am out of line or if my feelings make sense. TL;DR at the bottom.

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There are four dogs at my house. One is mine and my fiancee's, one is my sister's and her BF, and two are the family pets (my parent's dogs, although I pay the medical expenses). They are 1, 3, 8, and 10, respectively. They all got along fine for the longest time, but in the past 6 months or so there have been issues with my sister's dog (lab/pit mix) and the 8 y/o (white german shepard) have been getting into it when they are in the same space. We've been keeping them in separate parts of the house and let them out at different times, but it's not an ideal situation. If a door is left open or a baby gate goes down, they go at it, biting and latching on and won't let go unless we get between them and break it up. One time the 8 y/o got a bite on the leg bad enough that we took her to the vet, and while we were there we found out she had 10-15 mammary tumors. The vet said unless it's proven otherwise, it is most likely cancer. Looking back, there have been other signs like significant weight loss and appetite changes that also point to cancer. We think they may be fighting because the 3 y/o can smell that she is sick and is vying for the alpha spot, or the 8 y/o is uncomfortable and senses aggression from the younger one and wants to defend herself but, I digress.

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In recent weeks, the 8 y/o has been becoming harder and harder to deal with. She has been rougher with the other two dogs (pushing them around, mouthing their necks), and has been a lot more anxious and vocal. She is constantly whining if someone is not near her and barks at everyone, even if they just changed their shirt and came back. She doesn't listen to commands most of the time, and her attitude is getting to the point where I really just don't want to deal with her anymore. I feel bad because she was a good dog until recently, and I'm not sure what is the exact cause of the change. If it's because she is sick and she is in pain or extremely uncomfortable, she isn't physically acting like she is at that point. She still runs and plays and is not lethargic like one would expect from a girl in her late stages.

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Long story short, I don't want her to be put down, but I don't want to have to deal with her and the stress she is putting on the other dogs anymore. Unfortunately with my family and with her health and age, those are kind of the only options. So I ask, AITA for feeling this way?

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TL;DR: My 8 y/o white german shepard has cancer, and is causing issues with the other dogs at the house, fighting with one of them. AITA for not wanting to deal with her anymore?