Many dogs are pets, but some dogs have jobs. One of the most common jobs for dogs is working for the U. S. Customs and Border
Protection. These dogs work at airports, train stations, and bus depots,
using their powerful noses to sniff for dangerous or illegal things in
luggage. When you see these dogs, it is important to leave them alone,
however cute they might be. If they are distracted, they won't be able to
pay attention to their work.