See Dogs Poorly Suited For Hot Weather Some breeds are independent and aloof, even if they've been raised by the same person since puppyhood; others bond closely to one person and are indifferent to everyone else; and some shower the whole family with affection.
Breed isn't the only factor that goes into affection levels; dogs who were raised inside a home with people around feel more comfortable with humans and bond more easily.
So are breeds with short noses, like Bulldogs or Pugs, since they can't pant as well to cool themselves off.
See Dogs Poorly Suited To Be Alone Breeds with very short coats and little or no undercoat or body fat, such as Greyhounds, are vulnerable to the cold.
Some dogs may attack or try to dominate other dogs even if they're love-bugs with people; others would rather play than fight; and some will turn tail and run.
Breed isn't the only factor; dogs who lived with their littermates and mother until at least 6 to 8 weeks of age, and who spent lots of time playing with other dogs during puppyhood, are more likely to have good canine social skills.
See Dogs That Are Not Dog Friendly Stranger-friendly dogs will greet guests with a wagging tail and a nuzzle; others are shy, indifferent, or even aggressive.
However, no matter what the breed, a dog who was exposed to lots of different types, ages, sizes, and shapes of people as a puppy will respond better to strangers as an adult.