What do you mean "harder"? There are four hunting breeds in Russia: the Russo-European Laika, which is identical to the Karelian Bear Dog, the West Siberian Laika and the East Siberian Laika and the Karelo-Finnihs Laika, whcih is very related to the Finnish Spitz. The hunting style of the Karelain Bear Dog is similar to the four Russian hunitng Laika breeds. One difference may be important. The hunting Laikas have been bred mainly, if not exclusively by hunters and for the hunting. The Karelian Bear dog became popular among European show fancy public and somewhat changed as a result. There are a few genetic health problems among them. All Laikas are naturally hunting treeing dogs. They have an independent character and would not make happy anyone, who likes to teach his dog different tricks and obedience. To a squirrel, raccoon, moose or a bear hunter, this is the right dog.