"Mother Nature" tends to breed for sturdiness, intelligence, playfulness, ability to co-exist with other pets and people and longevity, so we can expect Sammy to be healthy and sturdy. His short haired coat indicates that he won't need a great deal of grooming or special care; and his loving family intends for him to live indoors, so that shouldn't be any concern.
The typical mixed-breed dog weighs around 40-60 pounds at full growth. A lot depends on the size and structure of the ancestors of your particular dog. Mixes of small dogs should result in smaller dogs, and mixes of larger dogs should result in larger offspring. It should be remembered that all "full-bred" dogs were once mixes of other breeds.
The young Labrador Retriever is an intelligent, high-energy dog that needs a lot of exercise or it will find "ways" to amuse itself. The older Labrador is well-known for their calm, amiable temperament. They are eager to please and do very well in obedience trials, agility and hunt. They are happy to play with the children in the morning and go hunting with the "master" later in the day. They love to swim and will thoroughly enjoy a backyard pool - preferably their own.
