Well, that link to Mayo Clinic says there's research suggesting female dogs and Labs may put out less allergens. A female Lab is a great companion. I have one. They hunt close, are easy to train for hunting. They are generally limited in their hunting endurance and heat tolerance, speed, and range, compared to E-pointers, GSPs, etc.. But, my 50 lb female Lab is a super companion, has a good nose, and produces birds reliably.