Hartz 2 in 1 Collar commercials. 1.) An animated dog and cat are put outside by their master and are scared by all he bugs outside in the yard. They cling together in fear. But with the flea collar that snaps in place around their necks, the bugs do not bother them. 2. Dogs running, and cats running. The collar protects them from fleas, people put it on dogs and cats. One dog jumps in a pool.