Uncle Sam adopted himself a mutt, he named him Last Straw. Uncle Sam took a liking to Last Straw and all those whiskers coming out of his nose, even though Last Straw wasn't the best looking dog Uncle Sam loved him.
Looks like Uncle Sam attached a blanket or towel to Last Straw,and is talking to him. Last Straw is not paying any attention. Last Straw is thinking I can hold this up if I want to, but I'm not going to pull this thing around the block anymore. Last Straw is tired and his back feet are shot from pulling the towel around the block, and he wonders why Uncle Sam thinks this is so fun, if he likes it so much he can tie it to himself and run around the block.
Last Straw and Uncle Sam are a good match because they are both a little odd.