Improperly fitted harnesses can cause chafing, restrict shoulder movement, and create chronic musculoskeletal issues, making correct harness selection and fitting an important welfare consideration.
The welfare implications of harness fit are less obvious than those of neck collars but no less important. Harnesses that restrict shoulder blade movement create compensatory gait patterns that over time cause chronic muscle tension, reduced range of motion, and potentially degenerative changes in shoulder joints. Dogs wearing ill-fitting harnesses may appear comfortable while developing cumulative musculoskeletal problems. Regular harness checks and removal when not actively walking or working represent minimum welfare standards for harness use.