I am so sorry to read this. We had a group of 10 girls at work and we lost them simulatiously to the same thing. Sadly being descendants from lab rats it’s the usual cause to their end. I hope that he continues to live a long life with you and that you can make the overal decision :( I’m just so sorry. A true pet owner is one who can put the animals needs above their own and already you show that.
Yeah he’s definitely old enough to be going this way too. When I was reading about rats when I brought him home, I read a lot about rumors.
He was going to be snake food so I grabbed him up and took him home. He would drive with me everywhere. I took him to the park and anywhere we would be outside. He never bit anyone, even as a baby. Just a sweet boy. Thank you for the kind words ❤️