What are John Wesley and Warn's speculation on what had happened to the mink?

John Wesley shows his mink to Warn. Warn guesses that it would be worth about ten dollars if it were in good condition, but it seems that it is basically worthless in its current, ravaged condition. They speculate about what possibly could have done so much damage and conclude that it must have been a bobcat, since nothing else around there, they think, has sharp enough claws to account for how shredded the mink is.