Generally speaking, a 10 lb. bag of SOJOSORIGINAL or an 8 lb. bag of SOJOSGRAIN-FREE will last about 6 weeks for a 26-50 lb. adult dog – while an 8 lb bag of SOJOSCOMPLETE will last about a month. An average sized cat will go through a 4 lb bag of SOJOSCAT Food in a little over 2 months.