"We watch The Dog Whisperer frequently, and we know what he means when he says to pick the pup out of the litter that is the most laid back. Most people go and pick out a dog based on their playful attitude because if a pup runs up to them they think the pup "chose them" when really it is just probably going to be a more challenging, hyper pup. We know this information now, but we did not know it when we went to get Bruno (or when we picked out our first two dogs), however he was the last male puppy left so we did not have a choice. I asked my husband why he thought Bruno was the last male left out of the litter and we later realized it was probably because he did not come leaping and bounding up to the other callers. The people that owned the pups had to go pick him up and bring him to us because he just sat at a distance observing the activity. When we first brought him home he went and sat in the corner all by himself after allowing the other dogs to greet him. We thought it was because he was so young and he was in a new environment. As the weeks passed Bruno was easily housetrained, never chewed anything up, and never "got in our face" for attention as the other dogs that we have liked to do. To this day if he wants attention he will just come and lie at our feet or sit by our side calmly. If we do not acknowledge his presence he will go lie by the door. When we took Bruno for his first set of shots, the vet said that he was extremely calm for a Lab puppy and said that he "was 1 in 100." Bruno will be 1 year old in January and we still have one of the best behaved dogs in the world with him."
A vigorous dog may or may not be high-energy, but everything he does, he does with vigor: he strains on the leash (until you train him not to), tries to plow through obstacles, and even eats and drinks with great big gulps. These dynamos need lots of training to learn good manners, and may not be the best fit for a home with young kids or someone who's elderly or frail. A low-vigor dog, on the other hand, has a more subdued approach to life.