Does 2,4-D cause cancer in dogs?
Multiple studies, including the 1999 study conducted at the School of Veterinary Medicine at Michigan State University, conclude that there is no correlation between 2,4-D and Canine Malignant Lymphoma (CLM). Regulatory decisions around the world confirm that 2,4-D is not an animal carcinogen.

Homeowners should continue to use herbicides in accordance with label directions and restrict access during and immediately following the application of products containing 2,4 D to maximize its efficiency and limit potential exposure.