My 13 year old dalmation is getting quite wobbly now physically and finds it all a bit of a strain getting on the sofas or beds! He can just about manage with a bit of a shove but it's getting harder.
I'm wondering though whether he's actually going a bit senile? Or maybe just forgetful in his old age? I feed him and 5 minutes later he's back looking expectantly at me - he's always been a greedy pig but he seems to have forgotten that he's already been fed. And he's starting licking the kitchen floor on the off chance that he'll find a bit of leftover food from the children's meal times!
He's getting very slow now so I suppose it's possible that his mind is slowing down as well?