 Hank s desperation attempts of getting his dog pregnant aggravate Peggy. Peggy becomes especially upset when Hank discovers Ladybird has narrow uterus and Hank decides the next best option would be in vitro fertilization. This revelation upsets Peggy because Hank didn t this hard when they were attempting to have children and when the idea in vitro fertilization came up Hank shot it down. Over time they realize that Hank s male biological clock is ticking and these attempts to get his dog pregnant is Hank unconsciously fulfilling his desire to have more children.