dog aggression due to old age?
Hi, I'm new and still learning options on this forum! I've had my GS for 7 years (got him from the local shelter). When I adopted him, he was not dog aggressive--including being gentle with my female (alpha) Aussie-mix. Unfortunately, my 16 yr. old Aussie died in early Nov. I've wanted to get him another (female) companion. I took him to meet some dogs at the shelter, but he was surprisingly aggressive at them. He would snap at their faces and/or rear ends. We tried a couple of different females--some very docile, submissive ones. But, no go. I understand that maybe his health (spondylosis) and/or age is a factor at this point (he's about 10). Needless to say, I do want to get him a companion as he is also showing signs of (mild) separation anxiety when I leave (pacing in b.y.) But, I want to respect his temperament and possible desire to be the only dog in his old age (?).
Has anyone had any similar experiences with their GSD? Any advice is welcome.