When I was a kid many moons ago I remember our cat must have swollowed a string of some kind because i can remember it hanging out of her bottom and my mom telling us not to touch it, she must have completely passed it because it was gone the next day, so hopefully he'll pass it without any problems, I'd say if it was going to start problems you'd probably already see them.. Your a good duck mom to take him to the vet...
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