The Prague Ratter, the Pražský Krysařík, is a Czech companion breed counted among the smallest dogs in the world, and its size shapes its paperwork. Adult weight, parent size, feeding detail, and careful vet records matter more here than in almost any larger breed, because a very small puppy has very little margin when information goes missing during a change of home.
Czech lineage and registration papers
Expect a lineage issued through the Czech kennel system or a recognised registry in the country of birth, naming the litter and several generations in the breed's characteristically compact family tree. Many Ratlik puppies, as the breed is affectionately known at home, are sold abroad, so an export lineage may be part of the set; check that your name, the puppy's registered name, and its black-and-tan or other colour description are entered correctly. The contract should confirm which documents are included and which follow later, and it should carry the breeder's full contact details. In a breed this small, breeders are few, and the paperwork is often the only durable link between your dog and its Czech lines.
Parent size and health records to request
Ask for both parents' adult weights and heights in writing, along with their health screening results. A Ratter's expected adult size is one of the main things a buyer is paying for, and the parents' recorded measurements, not a guess from photographs, are the evidence. Screening documents should be supplied as copies you keep. If the breeder describes a parent as vet-checked, ask what that check covered and get the note from the practice rather than relying on the phrase. File the stud dog's details too; with matings often arranged across borders, the sire's records may otherwise be the hardest documents to retrieve later.
The puppy's vet booklet and feeding notes
Before sale, the puppy should have had a full veterinary examination, first vaccinations with dates recorded, and regular worming, all entered in a booklet you take home. Ask specifically for the breeder's written feeding routine: what the puppy eats, how much, and how often, because tiny puppies need frequent small meals and a sudden gap or diet change hits them faster than it would a larger pup. Any episode the breeder mentions, a day off food, a treated cough, belongs on the written record. Weigh the puppy at collection if the breeder is willing, and note the figure on your copy of the paperwork as the starting point for your own vet's growth checks.
Chip transfer and the first vet visit
The microchip in a dog this small still carries the same legal weight as any other: take the transfer documents, have the number scanned and matched before you travel, and register it in your name the day you get home. At the first appointment, give your vet the Czech lineage, the parents' measurements, and the feeding notes, and ask them to weigh the puppy and record everything against the chip number. Keep travel documents with the lineage if the puppy was imported. KinsLe's Pet Passport then keeps the Ratter's registration, family measurements, and vet booklet in one portable packet, proportionate to a dog whose whole world fits in your arms.