Yes some of them if the dog is not quote ON quote PERFECT they kill in the US about sadly 100 thousand a day
you can and can not i mean because you need both a male and female dog to breed a puppy or the female dog already had a lover but left her and you can always adopt a puppy
Sometimes they lie on top of the puppies and suffocate them.
2 dogs of the opposite sex can have puppies
No only a male and a female dogs can have puppies.