Poor honey!

Hoping that rehydration at the vets's and some meds for the paw will set him right again. It sounds as if he has had a happy home with you. It gets harder on them outside as they get older and slower. (my old Dearie... she died at a very advanced age) moved in after years of refusing to be a housecat after a run-in with a racoon.)

Good wishes for you both.