That's up from 9 cases in the state last year.
Michigan officials say 49 confirmed cases of canine influenza have been reported since July 13.
That's compared with nine reported cases of dog flu in all of 2017.
The cases have occurred in Huron, Kent, Macomb, Oakland, Ottawa and Wayne counties, the state Department of Agriculture and Rural Development said in a press release.
Most cases of canine influenza are mild, and affected dogs usually recover within two to three weeks. However, more severe cases can occur.
“Any time dogs come together in groups, there is a risk for disease,” said Michigan’s state veterinarian, Dr. James Averill. “It’s important that dog owners work with their veterinarians to protect their dogs.”
Michigan isn't the only state where dog flu has been found. There have been two confirmed cases in Stamford, CT, the Stamford Advocate reports.