When exercising dogs outdoors, pet owners should ensure their pets are always on a leash or in a secure, fenced area to prevent them from running into traffic or getting lost. It's crucial to carry water to keep dogs hydrated, especially on hot days, and to avoid the hottest parts of the day to prevent heat exhaustion. Owners should be aware of their dog's limits to prevent overexertion and choose terrain that is safe and suitable for their dog's size and health condition. Additionally, keeping up-to-date with vaccinations and flea/tick prevention is vital for outdoor safety.