Phoenix Park is the largest enclosed park in any capital city in Europe. This pet-friendly park boasts a variety of walking paths and trails for you to enjoy with your pooch. Dogs must be on-leash at all times in the park. Make sure your pooch is close by and under control as the park is also home to a herd of fallow deer, who shouldn’t be approached. Certain areas in the park are off limits to dogs and their owners. Keep an eye out for signage when you’re exploring the park. Phoenix is open every day of the week, all day.