I had one, that used to beat the ladies legs black and blue with his tail. He was a really happy dog, especially in the kitchen.
Also had one that was half German Shepperd. Smart dog.
Big tail waggers they are. As far as being smart goes, Shadow picks up and carries his bowl in his mouth. Picture Snoopy with his bowl and replace him with a black Lab lol. At EXACTLY dinner time every night he picks it up and starts whining and walking back and forth between myself and the kitchen. It's like clockwork.
I also taught him how to “roll over” for a biscuit in a single evening. The kids love that trick and think it's hilarious.