I had a Pekepoo once, just a pup, who ate some dental floss.. She became very ill, and I took her to the vet, who said it was winding thru her intestines and tightening up. I paid $700 to have it removed! Big mistake on my part, allowing dental floss to fall on the floor. The vet also said horses will do this and eat the string off hay and it will also wind thru their intestines.
Patty