For safety and training reasons for both young kids and the puppy (who will grow to full size by 8 months), we do not adopt puppies to homes with children under 8 years old. Depending on family's dog experience, we may consider kids 6 years and older.
Puppies are very cute and harmless when they are small, but med-large breed pups will triple in their size in a few months. A teenager to young adult dog's natural behavior (teething, guarding and mouthing in play) and activity needs may cause accidents or harm to a young child.
A puppy needs constant supervision, training, socials and daily exercise to learn and grow up to be a good citizen adult dog. 80% of puppies are returned as young adults (1 1/2 - 2 years old) when they were adopted to families with young children under 8 years old due to lack of training and time. 70% of dog bite victims are children 2-7 years old. For these reasons, we recommend that families should wait until their kids are at least 8 years old or consider adopting an adult dog that is good with kids. Read Kids-Dog tips/Dangers.
Animal shelters, both public and private, are faced with an incredible burden: What to do with the overpopulation of dogs and cats that they cannot find homes for? Approximately 3.7 million animals are euthanized at shelters each year, due to the sheer fact that there are not enough willing adopters. Having your pet spayed or neutered ensures that you will not be adding to this tremendous burden.
Neutering of male dogs and cats can prevent certain undesirable sexual behaviors, such as urine marking, humping, male aggression and the urge to roam. If you have more than one pet in your household, all the pets will generally get along better if they are neutered.
A long-term benefit of spaying and neutering is improved health for both cats and dogs. Spaying females prior to their first heat cycle nearly eliminates the risk of breast cancer and totally prevents uterine infections and uterine cancer. Neutering males prevents testicular cancer and enlargement of the prostate gland, and greatly reduces their risk for perianal tumors. (Source: American Humane Association)
You can also read "Top 10 Reasons to Spay & Neuter your pet".