First long-acting flea, tick control for dogs rolls out in US

The launch in the United States of the first long-acting treatment to prevent fleas and ticks in dogs is stirring a mix of excitement and caution among veterinarians, as they weigh the benefit of uninterrupted 12-month coverage with concerns about neurological side effects that can be caused by the product's active ingredient.

The product's cost compared with shorter-acting treatments also has veterinarians wondering if some pet owners will be uncomfortable paying more up front for extended coverage, particularly for larger dogs that require a greater, and therefore more expensive, dose.

This story was published on Aug. 7, 2025.