Rich Man, Poor Man (1976)

S19E3 Boys & Squirrels

After Peter has a mishap with a chainsaw, hurting himself and a family of squirrels, Chris and Stewie decide to care for one of the injured squirrels, hoping to help it recover. In the meantime, Peter visits a chiropractor who adjusts his spine, ultimately bringing him back to his "real height" of 6'5".