I also have a 16-yr old female that sleeps all the time and since I work 12-hrs a day I don't get much time to play with her so I try to make it up on the weekends. She used to get "plugged up" all the time until I changed her diet to Medi-Cal High Fibre. She was on that for about 4 years with no constipation problems. I've recently had to change her again to a low-protein diet because of kidney problems but her BM's still remain good.

I agree with Russian Blue that more exercise will help. Good luck.