State officials say they've had three investigations into a bacterial disease that affects dogs in Michigan during the past four months.

The Michigan Department of Agriculture and Rural Development and State Veterinarian Dr. James Averill on Tuesday issued an update about Canine Brucellosis in dogs. They say the cases were investigated in Montcalm, Calhoun, and Mackinac counties.

State officials are encouraging anyone who suspects their dog is infected to get the animal tested. The disease is transmissible to humans.If your dog has brucellosis, he or she will probably exhibit some of the following signs:

  • Lethargy
  • Swollen lymph nodes
  • Difficulty walking
  • Back pain
  • Weak, sickly newborn puppies
  • Vaginal discharge
  • Swollen testicles
  • Inflammation of the skin around the scrotum

The Montcalm County case involves an occasional dog breeder with six dogs, including Boston terriers, pugs, and French bulldogs.

The Mackinac County case involves dogs brought to the state in 2011. The Calhoun County case involves a dog breeder with 14 breeding dogs.