"Hledáte ovci" is incorrect?
"Hledáte ovci?" is correct.
Why is it ovci and not ovce if its "a sheep"
The accusative case for a direct object.
"a sheep " Is one sheep -"ovce". In answer would be "ovce" but not "ovci"
Before posting thiese kind of comments plesse read the existing discussion. And read the Tips about the accusative case.