Oh dear, don't worry too much though, I've had a couple of incidences with Dozer swallowing stuff, back in August he swallowed a Chinese food honey garlic bone that my husband put down for a second, he coughed a little bit, but he seemed fine after that, the next morning, he threw up a little, so I didn't feed him in case there was an obstruction somewhere, and I took him to the vet, she did a X-ray which she said would show it because it was a bone, she didn't find anything, and said dogs stomach acid is different from ours and probably would break it down, or he would pass it. She told me to watch for trouble pooping, or for vomiting as these are signs of an obstruction , just keep an eye on him for these signs , and if you see any sign of trouble , take him to the vet. The other thing you can do is go to your vet and buy a fibre dog food, and feed it to him for 3 or 4 days, a Tbsp or 2 every hour. I had to do this to Dozer 2 weeks ago, because after he had his neuter surgery, they placed him in recovery, and 5 mins later they checked on him and he had ripped off his gauze and bandage and swallowed it. When I got there all the vet could say to me was Dozer Dozer Dozer, lol. She told me to give him the fibre food to push the bandage down through his intestines, and again to watch for trouble pooping, or vomiting, as this would mean an obstruction. We feed that food for 4 days, he got really mushy poops, and went to the bathroom a lot. Nothing happened, but he was eating, and pooping normally. By the way that gauze and bandage were about 12 inches long, they were wrapped around his IV site. After a week, I came home from work, it was getting dark outside, and I took him out for his duties, he started circling around the yard, but wasn't pooping, he usually poops right away when he goes out. He also seemed to be having a problem going to the washroom, so I knew he was passing something. He finally went, and lol it was very long. I couldn't see in the dark, so I scooped it up in the poop bag and brought it inside for examination, lo and behold it was his poop wrapped around a loooooong piece of cotton gauze. He had passed it finally. The gauze is kind of like the material yours ate, and he will probably pass it, so don't worry too much. I know hard not to do, but if you are worried call the vet tomorrow and see what they say. Good luck, and hopefully it passes ok. Keep us posted.