The Pražský Krysařík (Prague Ratter) is a small breed of dog from the Czech Republic that is rarely seen outside its country of origin.

The Pražský Krysařík is a small toy dog, similar in appearance to the Chihuahua and the Miniature Pinscher, with a height of 20 to 23 centimetres (7.9 to 9.1 in) and a weight of 1.5 to 3.5 kilograms (3.3 to 7.7 lb).

The Pražský Krysařík adapts well to full-time indoor and apartment living, yet still enjoys spending time outdoors, playing games such as fetch, and taking long and leisurely walks.

[3] Due to its need for human attention and eagerness to please and impress its owner, the Pražský Krysařík generally responds well to basic training and commands.

In historical chronicles and literary works, ratters are mentioned in connection with Wenceslaus IV, Rudolf II and other European rulers.

[5] In the era of the absence of cats in Europe, tiny Pražský Krysaříks, along with other rat-catchers, served to protect the property of the royal owners from rodents.

Legends say that in the royal houses krysaříks were also obliged to protect the owners from poisoners: during meals they were allowed to walk on tables and taste food and drinks.

The first stage of the revival of the breed and the compilation of stud books began at the end of the 19th century under the leadership of dog breeders T. Rotter and O. Karlik.

Modern Pražský Krysaříks trace their history since the 70s of the XX century, the key role in the revival of the breed was played by the canine scientists Jan Findejs, Rudolf Šiler, (1909-1997).