
Can't help you with a carrier although if you Google, you'll find some - the people we used, once, to board while we moved across country, did this but I've forgotten their name. But I would caution you about buying a puppy from somewhere like Slovakia unless you want the bloodlines, know the breeders (or have somebody you trust to go check on the set-up) and have been to see the litter (preferably) beforehand. In which case you could go again and bring him home yourselves?
http://www.animalcouriers.com/ Here is one and they may be the people we used for boarding.
There have been some horror stories about imports from that part of the world. Hopefully all is okay in this case?