"Brucellosis is a contagious disease caused by the bacterium Brucella canis. It is one of the leading causes of infertility in breeding stock. It occurs worldwide, affects all kinds of dogs, purebred and not, and can also be transmitted from dogs to humans..."

An article exploring the myth that reputable breeders contribute to overcrowded shelters, and where the real fault lies...

"On May 29, 2019, canine brucellosis was reported to have been imported into Wisconsin in a group of 26 South Korean dogs legally brought into the U.S. through Canada. While the group was awaiting importation, one dog in the group died. Symptoms and gender of this dog have not been reported. However, a veterinarian in Canada tested this dog and found it was positive for canine brucellosis. By the time the test results were available, the dogs had already moved into a Wisconsin shelter and had been co-mingled with approximately 100 other dogs..."