They are clever little dogs and they boast having all the usual terrier “traits” which means they love to chase anything that moves which includes smaller animals and pets. It would be a mistake to trust a Cesky with any pets because their prey drive would get the better of them which could end in a disaster. Puppies need to be well socialised from a young age which has to involve being introduced to as many new situations, people and other animals as soon as they have been fully vaccinated for them to mature into well-rounded, confident and well-behaved dogs.