My older sister(23) has a dog and forces almost every responsibility on my mother and younger sister(13).

I refuse to do anything to help with the dog as me and my older sister got in a big arguement before she got it as i knew she wasnt ready to take care of a dog. But sometimes I do cave in and help out as I feel bad for the dog.

The dog is untrained as after many years and daily will pee on the floors and poops inside the home, we live in a small apartment and its really awful.

My older sister these past few months lives with her BF and only returns like a day or two each week. Thus leaving everything to my sister and mother. 

I think its really unfair for her to just abandond the dog, my mother is always complaining about it to get me or my little sister to clean after it, everyday I have to dodge stepping in piss. Also ,smelling piss and seeing shit on the floor everyday is not fun.  
I really dislike having to see this dog being left like this, nobody really plays with it and barely takes it out for walks and it breaks my heart. She has been jobless for over a year now and Im baffled as to why she cant train it or take care of it.

I dont think she is fit to have this dog and I think the dog would have a better life in another home, I just can't bare watching nobody care for it anymore and waking up and coming home to warm piss and shit.

  
WIBTA if I told her she should get rid of it or at least take it with her to her BF's?