Prague Ratter (Prazsky Krysarik)
| Size at withers | 20-23 cm |
|---|---|
| Weight range | 1.5-3.5 kg |
| Life expectancy | 12-14 years |
| Size class | Toy (< 10 kg) |
| Normal resting vitals | Heart rate 90–140 bpm · Respiration 15–30/min · Temperature 38.3–39.2 °C |
| Temperament | Alert, lively, affectionate and trainable; bonds strongly with owner |
| Common health issues | Patellar luxation; dental disease; fragile build prone to injury |
| Exercise needs | Low - short walks and indoor play |
| Climate & housing suitability | Fair, being very small and delicate; needs protection from heat and cold alike. |
| Owner notes | Historically kept as a ratter; not FCI-recognised internationally though well established in its homeland. |
Origin and purpose
Toy / Companion; FCI Group 9. Origin: Czech Republic; among the smallest dog breeds.
Historically kept as a ratter; not FCI-recognised internationally though well established in its homeland.
What a breed was built to do explains most of what it will do in your home. A dog selected for hundreds of years to run, guard, herd, or hunt does not stop wanting to because it now lives in an apartment — the drive is the breed, and the owner's job is to give it somewhere to go.
Temperament and training
Stated temperament: Alert, lively, affectionate and trainable; bonds strongly with owner
This is a biddable breed that wants to work with you, which makes it forgiving of a novice's mistakes — but biddability is not the same as needing no training. Reward-based training, started early and kept short and frequent, is what these dogs thrive on. Punishment-based methods damage exactly the willingness that makes the breed easy.
Conditions this breed is predisposed to
Patellar luxation
Periodontal disease
Health screening — what to test, and when
| Screen for | Test | When |
|---|---|---|
| Patellar luxation | Patellar palpation by a vet | At each annual examination from 12 months |
| Periodontal disease | Oral examination; dental radiographs under anaesthesia | Annually from 2 years — earlier and more often in toy breeds |
Every dog, every breed: an annual health examination (twice yearly from seven years), body-condition scoring at each visit, dental assessment, year-round parasite control, and the core vaccinations.
For breeders — test before you mate
- Patellar luxation — Patellar palpation by a vet
Feeding
Small stomachs, fast metabolisms. Feed a diet formulated for small breeds, split across three or four meals a day as a puppy and two as an adult; toy puppies can become dangerously hypoglycaemic if a meal is missed. Portions are tiny, which means treats and table scraps overwhelm the daily allowance startlingly fast — a single biscuit can be a meaningful share of a 4 kg dog's intake. Dental disease is near-universal in small breeds, so ask your vet about diet texture and dental care from the start.
Exercise and enrichment
Stated requirement: Low - short walks and indoor play
Modest exercise needs, but 'low exercise' is not 'no exercise' — this dog still needs daily walks and enrichment, and is prone to obesity if it does not get them.
Climate and living conditions
Stated suitability: Fair, being very small and delicate; needs protection from heat and cold alike.
Ageing and senior care
Life expectancy: 12-14 years. This dog is a senior from around 9–10 years, at which point wellness examinations should move to twice a year and senior blood and urine screening begins. Small dogs age slowly and often live into their mid-teens. Dental disease and heart-valve disease are the two things that most often shorten a small dog's life, and both are catchable early. Senior care →
Before you take one home
- Ask the breeder for the health-test results listed above — for BOTH parents, on paper, before you pay a deposit. A breeder who has done the tests will be proud to show you; one who deflects, or who tells you the tests are unnecessary in this line, is telling you what you need to know.
- Consider adoption. Shelters and rescues have dogs of every kind, including purebreds, and the local native or landrace dog is often healthier, better adapted to its climate, and more in need of a home than almost anything you can buy. See Part XII.
