I'm not too sure what to do. I have 2 male Jack Russell's (both just a little over a year old). The two play all the time and get along well with each othe. Also, the youngest is neutered, but the other one is not.
I just recently got a German Shepherd puppy. The problem is, my oldest Jack Russell is showing signs of aggression towards her - if she goes near him he growls and the hair on his back stands up... He is also just going out of his way to avoid her completely... My other dog is just friendly towards her. I don't understand this at all because my oldest JR never did this when we got our second JR - he was a rescue dog that we adopted when he was about 6 months old.
I have no idea what to do about this. I am too afraid to leave her alone at all with my other dogs...
Thank you in advance