Living in Arizona , walking my dog even at night, he walked slowly and panted for some time after coming home. The first night out with his Ruffwear cooling vest he trotted the entire walk and did not pant during his walk or after he came home. He is a husky/lab mix so his being able to be cool here in the summer is amazing! This is my second big dog I’ve had while living in Arizona and my first dog wore an older version of your cooling vest and it worked wonders while hiking in the desert.