We are sorry to hear about Max , and thats as sad when Our Older Pets deterirate both mentally and physically as it is with Older Members of Our Human Family.
I have talked to My Vet on this and he says thats its more than possible that Our Cats can suffer from semility. This worries me as My Princess is 18, maybe older , Michael is 18 and Juke Joint Joseph is at least 16.
Hes recommendinng some books at the Library so I can read up on this and there are several issues of Cat Fancy that deal with this heart breaking problem.
I know that Bo Bo this year become reclusive as did My Moose and Princess had a spell where she was peeing on my bed. But shes over that now.
I have to close off the basement as thats the first place that My Older Cats want to go when they gointo hiding.
We are sending prayers for Our Dear Friend Max, and pray that you can have him in as good health as possible for as long as you can.