Ive had my ball for 5 or 6 years. and i never had a problem with him... recently i noticed he has bumps near his tail... hes moving fine, last time he ate it was fine, but... i niticed he has not go poop yet. its been like 3 weeks... what should i do? could that be whats causing the blockage? he went last month... im scared to feed him again until i see the rest come out....