April 27, 2026 – Texas has emerged as the nation’s leader in canine heartworm cases for the first time, according to new data released by the American Heartworm Society. The group’s 2025 Heartworm Incidence Map, published earlier this month, shows the highest concentration of infections in eastern Texas, highlighting a growing concern for pet owners and veterinarians. The survey, conducted in early 2026 using data from more than 1 million heartworm tests performed in 2025, found that veterinary clinics in Texas reported an average of nearly 50 heartworm-positive dogs each. That represents a...