Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not safe

I purchased 4 of these for my yellow lab. We usually buy the chicken flavored ones at a store, but I bought these on amazon because they were on sale. They are a noticeably different color, which I assumed was due to the liver flavor. They are also a noticeably different texture than the nylabones I have purchased at a retail store. I also noticed that my dog destroyed them much faster than the others as well. A couple days after giving one to my dog I noticed large white chunks of sharp nylon in her stool. This is extremely dangerous. I will be trying to return the other 3 soon.