5 random reasons this dog might have undies in his mouth.
1) He just finished playing strip poker. He lost.
2) His owner ran out of sticks and newspaper. And was multi-tasking on laundry day.
3) He is going to cross a stream and doesn't want to get them wet. (This seems smart)
4) He confused bacon strips with begg'in strips.
5) The dog needs to buy more under wear. And since he is unable to write down or remember his size he is taking them to the store for good measure.