Let's Spend the Night Together - S7-E2
Factual error: After Kelso gets the call that his girlfriend's water had broken and runs out of the room, Fez answers the phone. In the background there are several license plates on the wall, one of which is an Indiana "Amber Waves of Grain" design, which was first issued in 1993.
Answer: It's Ashton Kutcher's dog.