I'm wondering if Spencer is showing signs of it. He is now 12 1/2 years old & I've noticed changes in him over time, but recently have noticed some additional changes. For example he has developed some fears and I do not know where they are coming from. Recently whenever I cook he panics & insists on going outside (I didn't think my cooking was that bad! ). I bought him a new bed that he slept in for 2 weeks and now he won't go near it. He shows fear around people he knows and never previously had problems with. I have caught him staring at the wall and just getting up and barking for no reason (that is apparent to me anyway). He's been to the vet recently and checked out ok. I am dealing with some separation anxiety since he had a recent lifestyle change, but it is improving. He is taking Clomicalm and I am trying some behavior modification with him. I talked to the vet today and he seems to think there may be some cognitive dysfunction going on. He wants me to continue to work on the separation anxiety to see if things continue to improve overall, but I honestly don't think all his behaviors are due to the separation anxiety. Some existed before that all started. Generally he seems happy, still shows interest in walking and playing, but does have moments where I wonder....