But my mom's siblings dogs were BFFs for 15 years and my friend's sibling dogs are still very close at 6 years old I don't think there's a "hard and fast rule" on this.
As a foster, I do think 2 puppies are a lot more work than 1 puppy! While 2 kittens are about the same amount of work or less work than 1 kitten.
#AdoptingaPet