Here’s an article you’ll want to review, save and share. With funding from the AKC Canine Health Foundation, Cynthia M. Otto, DVM, PhD, DACVECC, DACVSMR, tested different cooling methods.
A voluntary head dunk in 70°F water delivered the fastest and most sustained reduction in body temperature.”
Source: AKC Canine Health Foundation, July 8, 2025. Link. It makes sense. Dogs pant to regulate heat, which increases blood flow to the head. Cool the head, and you cool the dog faster.”