I have a 7 year old Female dog that has just started being aggressive to our other dogs, she has never done this before and it is violent. We had to physically pull her off and she punctured the neck of our other dog.
Any one have any suggestions as to why she is starting aggression now?
First question is she spayed? My unspayed female Pyr used to become very grouchy towards the other animals in the house when she was in heat. Any other time she was wonderful with them all.
My next suggestion would be to have her examined by a vet and have some bloodwork done. At the age of seven she could be expeiencing physical or metabolic changes that are causing her to act like this. Being painful due to arthritis or maybe a thyroid problem could be a contributing factor. I would have her checked to rule out any health issues.