That sentence makes our dogs go crazy! It doesn't matter what you say afterwards, they know they are going for a walk. It's the same thing everyday; Charlie has to sit and be quiet before we put his leash on. Meeko, not so much. The saying "you can't teach a dog new tricks" was invented because of Meeko.
So, you would think after almost 2 years of going on walks, Charlie would hear "Do you wanna" and immediately sit down. But, without fail, he acts like a crazy animal. I love it and hate it all at the same time.