Smart dog?

A guy walks into a bar and orders a beer. While drinking he looks around the bar and
sees three men and a dog playing cards. Amazed, the man wanders over and starts
watching the game. After ten minutes, the man leans over to one of the guy’s and
whispers, “Wow, that's a really smart dog!”
The man whispers back, "He isn't that smart, every time he gets a good hand, he wags
his tail!"