There was a poster printed years ago that was included when I ordered a set of encyclopedias. It stated a source for the facts on the natural breeds ( before man started cross breeding which caused these poor boxers to have breathing problems and snore and digestive problems causing gas and then there is the pit bull with the temperament problem) was from the American Breeders Association. A Collie is considered intelligent, high energy and a natural for herding.(remember the TV show Lassie) a German Shepherd and Golden Retriever, and a Labrador are considered highly intelligent. A Dalmatian is considered to have too much energy for small children. The Norwegian Elkhound and Husky do not do well in a warmer climate. I had a German Shepherd who was jumping and barking after I had all 3 sons in the car for baseball practices. I asked my sons what's wrong with her and I got out of the car and walked over to her and asked what's wrong -- what is it? She looked at the car and kept barking and jumping around. I told her I did not understand and she put her head down toward the ground and was very frantic. I got down toward the ground and looked while following her eyes and then I saw what she saw ---the car had flames burning around the gas tank. Yes, thanks to her, I got my sons out before the car exploded.
A chinese sharpei. They're hypo-allergenic Friendly Great guard dogs (They sound really mean on the other side of the gate) Trainable and a majestic breed Very defensive with their "family" (Mine does not let anyone past until she has sniffed them DOWN)
Catahoula, They are dogs that deal very heavy damage to intruders, they are used to hunt bore and hogs. Also as police k9 units. as well as a couple of miltary applications. Very smart and can be trained at many levels and are completely obedient when trained. They are more protective than german shepards. If you need a dog for protection and as a family pet, research catahoulas. Training might cost a bit but when invested, they are obedient and viscious and playful. In the respective environment.