Briona ate 1 used pad once and was fine!
I would keep an eye on the dog and watch for any vomiting, lack of appetite, repetitive straining with nothing coming out. Chances are everything will pass fine. But if the dog stops eating or drinking and vomiting back anything it does eat/drink, gets listless, that could be a sign of a blockage and surgery may be needed.
One thing though, tampons are made to absorb and expand, I would be concerned this would happen and they would not be moved along in the intestines, especially 10 of them. I would keep a close eye on the dog and the first sign of distress go to the vet.
Addie had obstruction surgery and luckily none of her intestines died, there was still enough room that stuff got through so they did not have to remove any part of her intestines.