In Castro Valley, dog-friendly food and drink options range from casual to upscale. Many establishments offer outdoor seating suitable for pets with water bowls available. Treat policies vary, so it's best to inquire beforehand. Wineries in the area often welcome leashed dogs in outdoor areas. Expect a relaxed atmosphere conducive to enjoying wine with your furry companion. Be mindful of other guests and keep your dog well-behaved. Check individual establishments for specific pet policies to ensure a pleasant experience for you and your pet.