Really you have answered you own question.
Your Mom's dog is aggressive and would most likely not respond well to one in the house full time.
Now here is the but..... My girl is aggressive to dogs but is choosy about who she will go after and who she will not.
I was told to try and date a younger pup for a while opposite sex as early as six weeks and still with the breeder. Let her pick her partner. That takes a breeder willing to put the pups at risk as they are not finished with the shots.
I would try and get your Mom's dog out with other dog wise dogs not aggressive ones and just see.
Also if she willing find someone that is knowledgeable about aggression in your area and have them assess your Mom dog, it may be an easy fix and sometimes not so.
It is better to give advice seeing a dog and owner together and watch them interact and know what is going on then to really. I can only give my best guess as in this kind of a situation on line.
One other thing We tend to think all dogs need company and best in pairs for playmates. Some dogs just like humans are loners by heart and better , happier and healthier left that way.
Joy |