If you seriously want to save a dogs life by adopting at a shelter consider an adult dog. Adult dogs are more loving than pups. This is natural. It's an entitlement. Nurturing a pup is enriching, but the complex relationship possible with a mature dog is both deeper and more unique.
Adult dogs are frequently easier.
Less prone to chewing, jumping, and general mayhem, they're often more satisfying companions. Puppies are emotionally dependent as well as physically needy. The increased self reliance of adults can make them far easier in a home where the adults work and the children are in school. IF your home and lifestyle are suited to a 'baby dog'. An older companion dog for the puppy could be considered, but don't adopt a dog you have little enthusiasm for out of a sense of guilt or obligation.