Animals face dire conditions in certain parts of the world. But before you bring one home, be aware that you could be transporting infectious diseases, too.

Last year, a puppy brought into Canada after being rescued from a Korean meat farm was diagnosed with a form of canine distemper virus that was new to North America.

Earlier, in 2015, a novel form of canine influenza exploded in the Chicago area, affecting over 12 hundred dogs. The virus was ultimately traced back to China and Korea.

Closer to home, thousands of dogs displaced by Hurricane Katrina were sent north. Over 60% of them had heartworm infections, which they carried throughout the country during relocation.

So, if you’re thinking of bringing an animal back to your part of the United States, first work with your veterinarian to make a plan.