It takes one dumb or very tolerant pooch to put up with being tugged at, ridden and having his food bowl swiped from under his nose. Just as a puppy must learn the rules of acceptable behaviour, so, too, must family members. Having said this, there are certainly some breeds that fare better around children than others. Look for those that have even temperaments and possess enough size or innate toughness to weather childish affections. I would discourage the choice of large animals capable of inadvertently sending toddlers sprawling, and Toy breeds that, along with the family porcelain, should be kept away from small children.
Some breeds are more expensive to maintain than others.
Apart from grooming costs, you may want to consider that the larger the dog, the larger the food bill. As well, some breeds are predisposed to more congenital problems that may require regular veterinary attention. If you follow the rules and prescribed methods, most dogs can easily come up to snuff on basic training. However, beyond the fundamentals, temperament, instincts and willingness are traits that may affect a breed when it comes to higher learning. Although all breeds are trainable, the effort required can vary.