Factual error: Eric compares Jackie and Kelso's breakup dilemma to "Sophie's Choice...but for morons." Sophie's Choice was not published until 1979 (the movie in 1982), when this episode takes place in 1978. (02:49:00)
Factual error: Eric makes a reference to "Sophie's Choice." This episode is set in 1978, but the book "Sophie's Choice" wasn't published until 1979, and the film adaptation wasn't released until 1982.
Answer: It's Ashton Kutcher's dog.