While there's not too much to say about a four piece set, this is a good one.

A vet and a bunny fits nicely with any of the zoo, farm or even family Duplo set - good cross theme appeal here. It also helps that the bunny and the vet figures are good looking as well. The block and the flower give the vet something to work on and the bunny something to eat, so pretty good play-ability for four blocks. Can't think of a negative about this set.