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.”