A man and his son were walking together

A man and his son were walking together one day and stumbled across 2 dogs having make love.

“Why is that dog hurting the other one?” asked the boy.

“He’s not hurting her,” said the dad “they’re making a puppy.”

A couple of nights later the boy walks in on his dad and mom making love and asks “Daddy why are you hurting mommy?”

“I’m not hurting mommy” said the dad, “We’re making you a baby brother.

“Excitedly the boy screamed “Flip her over, I’d rather have a puppy.”