One day Beefy will have firm poo and then a day or two later will have runny poo. The breeder had him on Science Diet () and he was having allergy issues. I'm not sure how she didn't see it or maybe she didn't care. Anywho, I put Beefy on Nature's Variety Instinct Duck and Turkey and he has done great. Allergy problems stopped and he was gaining weight like he should but we have the poo problem. Would the food cause this?