Fall Feet 5k
Dogs can participate in the 5k Run/Walk; the official RunSignup page says dogs are allowed if well-behaved and on a 6-foot leash.
Dog-friendly trail race directory / PA
Browse trail races that go beyond pet-friendly venue language and include public source text saying dogs can participate on course in Pennsylvania.
Trail races in Pennsylvania are filtered from the same source-reviewed Dog Powered Events directory, with direct links back to public event sources.
Use the state page for local discovery, then confirm the current organizer source before registering or traveling.
Directory
Dogs can participate in the 5k Run/Walk; the official RunSignup page says dogs are allowed if well-behaved and on a 6-foot leash.
Official UltraSignup page says dogs are welcome to run with participants during the race; NACC lists the event as a Dog Friendly Trail Race.
Official RunSignup page lists a 5K and 1-Mile Dog Walk and awards prizes for the top 3 dogs who cross the finish line.
Official RunSignup page lists Gulliver's Run as a 5K trail run/3.5K walk for dogs and their human companions and asks participants running or walking with a dog to contact the organizer.
Buck Ridge Burn 5k-ish, 10k-ish is listed as a dog-friendly trail race. Check the official source for current course and leash requirements.