Of course Simba is not just a dog.
My dogs are my best friends too.
If Simba is developing arthritis, how about
getting a wide step for him to get off and on the
bed. (RV stores sell them)
Sheba has arthritis for years, and I would give
her a buffered asperin now and than.
At almost age 11, I am now just trying perscriptions meds for her.

Simba has a lot of years in him, please do not
worry.