
The cage should be big enough for the pup/dog to stand, sit, turn around, and lay down stretched out. If they want one so the pup can fit when full grown you can get a big one and just put something in behind to make it smaller and remove as pup grows. There is a name for it but can't remember for the life of me. Have they checked with their breeders to see what size of kennels they use? I use kennels the size for a golden for my boston terrier's because I like them to have alot of room, and they don't mess in it.
Good luck :)