My wife and I have had mostly small dogs (Maltese and Yorkie's), mostly because of limited space and time when we were working long hours. Growing up I had larger dogs, spaniels, Golden's, labs, etc. You need to think of both the environment the dog will be in and animals it will interact with. Dogs with long fur will be more prone to pick up fox tails, mud/dirt and also long eared are usually more prone to ear infections in particular if they swimming a lot. If it is going to be mostly an outside dog, something to think about. Pure breed dogs can be more prone to certain heredity problems like hip dysplasia, some breeds like Golden Retrievers are very prone to liver cancer (ours passed when he was 8 years old). Long haired dogs tend require a bit more maintenance such as washing and grooming But it all comes down to overall health and disposition/personality of the dog. Most important part when evaluating a dog for the family is to be in a calm environment when seeing a dog, see if they come to you and how quickly they quiet down and respond to you. Do they maintain eye contact with you, often the dog needs to choose you as well, but look at the personality traits, take your time and if possible that of the parents. Have them checked by the vets ASAP when you bring them home. Get them micro-chipped and vaccinated.
We had a 95Lb golden lab that was a lover boy, he was calm and always good matured, but I had friends that had black labs that were full of energy and would never obey commands. One took off after a cat and got hit by a truck, the other had a similar fate. So not as much as the breed but the disposition. Our Golden Retriever was the most empathetic and sweetest big dog we had, broke our hearts when he passed. Other breeds to consider that are amazingly smart are Blue Heeler. If we had more open area, I would have also considered a Rhodesian Ridgeback, they can be very sweet, but also very protective.
One downside of trying to find a breeder is the vast majority of on-line sites are fake scams. We are pretty savvy checking sites, but we recently got a Yorkie puppy and several sellers my wife was getting strung along until I did some checking and found they were all scams (80% are fake). We eventually found a local breeder that we could go to, check out the puppy and the parents, as well as spend some time with the puppies. The white lab of mattthemuppet2 might be a good fit, we always prefer to get a puppy/dog that is brought up in a home (not a puppy mill), with other animals and well socialized with animals/people. With puppies, potty training is usually much easier with bigger dogs then smaller ones, try to not use foods that contain corn meal and animal byproducts.
BBB Resources: Pet Scams How to protect yourself from fake online pet sellers, your Better Business Bureau is here to provide tips and resources to avoid falling for a pet scam. If you are looking for a pet to add to your family, be on the lookout for scams. As consumers turn to the internet...
www.bbb.org