Dexter, an adorable three-year-old pygmy goat with special needs has alarming blood in his urine. Marley, a two-year-old leopard gecko, is losing weight and has an enormous abdomen. Lucy, a two-year-old rescued Easter bunny, comes in for a growth on her chin, but Dr. K discovers a much bigger problem. And Bubbles, a five-year-old female guinea pig, may be pregnant!

It's a week of ups and downs at Dr. K's clinic when Paco, a seven-year-old sun conure, has a giant egg that won't come out, Pepe, a seven-year-old kinkajou, has burns on his tail and back paws, and Shar, a one-year-old prairie dog, has a big lump on his belly. And the staff must give bittersweet farewell to a beloved colleague as Dr. Thielen's time working at the clinic comes to an end.