by Dee. B
My dog is a border collie mix, she was a shelter dog and abused when we got her 15 years ago, she is about 16 now.
Tess has always been a good pup, she always felt a need to scavenge for food but we figured she was found on the street and that was her nature as much as we tried to fix it.
She has cataracts, nothing we can do about them and she has lumps under her skin, but she has recently become very aggressive toward our Mastiff/Shepard mix whom we have had since a pup and is about 9 years old: anytime a family member comes home or has food she snaps and attacks our other dog. He refrains from being around her, but she seeks him out. What can we do.