Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Inability to handle numerous proteins

I switched my two boston terriers (one is 16 pounds and the other is 24 pounds) to Chicken Soup over a 10 day period. I noticed they had considerable gas, but assumed it was a temporary condition from switching to a new food. Once they were only on the Chicken Soup, they had diarrhea, black and tarry stools. I immediately switched them back to Science Diet. I contacted the company and asked if they knew what could have casued this digestive upset - they responded that the numerous protein sources were probably the cause. So maybe boston terriers don't do well with this type of premium dog food. I would recommend you purchase a small bag first, in case it doesn't work out.