I have a 16 year old cat named Princess. I have her litter box in the basement and lately I've noticed she as problems going up and down the stairs. There are 11 total steps from the first floor to the basement and Princess would take 2-3 steps and stop, take a breather and take another 2-3 steps until she reaches the bottom. Same story when she comes up but a few days ago she had no problems going up/down the stairs. Also she loved to jump on my bed and keep me company and lately she hasn't been doing that. I was wondering could she have arthritis, if cats can even get arthritis in the first place?