A Farmer Comes Home To Find His Sheepdog

A farmer comes home to find his sheepdog waiting for him.

The sheepdog says:

“I herded the sheep into the barn, just like you asked!”

“You sure you got them all?” The farmer replies.

“Yep! All 40 of them!” Says the sheepdog.

“40? But I only have 37 sheep.” Replies the farmer.

The sheepdog answers:

“I know. I rounded them up for you.”