Do I report this or let it go??

Cobain🎸

I live on the east coast due to my job, but am from central California. My husband, 4 mo old son and myself will be visiting CA for Christmas for 10 days. My oldest sister offered for us to stay at her house...... there's one problem. My other sister/her husband live in the house, as well. They have an old english bull dog who bit and drew blood on a friend of theirs, and he also bit my oldest sister about 2 mos ago, so badly that her RN banned her from work for a week until the wound healed. No one has reported this violent dog, and my sister and her stupid ass husband refuse to get rid of it. I told my oldest sister we will stay there as long as they promise to keep that vicious dog out of the house completely for those 10 days. My sister told me today that she talked to them and they refused to compromise and will be letting the dog in the house every night to sleep. My oldest sister is now very distraught and pissed at my other sister because I just can't stay there.

I just can't believe this is a debate???? My oldest sister is terrified of that dog, but she wont report it because they will know she did it and my other sister and her husband think there's no risk to have him around my baby. Looks like we will be staying with my MIL again!!