Active but mellow, friendly, protective, and at times stubborn, the Cesky Terrier temperament is one that combines spunk and affection. Though they're considered a "chill" terrier breed, Ceskys still exhibit the classic terrier qualities: they're not great with other dogs, they can be stubborn and independent, and they love to dig and chew. And their history as small game and vermin hunters gives these dogs high prey drives, so they will instinctively try to injure rodents, birds, and other small pets.
Al that aside, the Cesky can be very affectionate and loving. Though as puppies these dogs will be extremely energetic, once mature they usually settle into being friendlier, calmer animals, and will make great additions to any family--if said family is lucky enough to find one!
And though fairly smart and trainable, Ceskys can be a bit hard to teach because of their stubbornness. Owners should use consistent, positive, reward-based training methods with these dogs--and don't be surprised if teaching tasks and commands takes a few repetitions. The Cesky is just taking extra time to decide whether it wants to learn what you're teaching! And as with any breed, harsh training styles are not recommended.
Ceskys, will make great watchdogs too. Though not overly "yappy," they're alert, bold, and curious, and should sound a vocal alarm if confronted with a potential threat.