When cats are aroused or upset at something, they may get angry or redirect frustrations on a third party. If the cat is upset by a trip to the veterinarian, it may lash out at overzealous children or owners later at home. It's best to leave them alone, let them hide and don't go get them. Further, yelling at the cat when angry probably does nothing but humiliate owners and cause anxiety in the cat. Unlike dogs, who react visibly to scolding, cats do not feel socially bound to human owners as their pack.
Dogs are much more a part of the family.
In their minds, we're part of the pack.