We live in Colorado and have extremes of weather; from over 100 degrees in summer, down to 10 in winter. Ara, my female Standard Poodle joins me for a 5 mile bike ride every morning, and since she sleeps on my bed at night the dog boots are an essential tool to eliminate the numerous chemical used outdoors, especially pesticides used on lawns. The harness is also a valuable asset; especially when she sees a cat, and can easily run 35+ MPH in pursuit.