Nature Gnaws Tripe Twists. When my dogs are chewing on them, they break into small sharp pieces. My Toy Fox Terrier, age 14 yrs, had loose stools with lots of phlegm and some red in it. She goes on a Pooch Pad in the house. Never happened until I fed these. My German Spitz, age 8 mos., ate it way too fast, with lots of small sharp pieces also. Not sure about his stools because he goes outside in a very large yard, but he has been gagging and trying to throw up. I am disabled and can't follow himSee full review