State parks are usually the easiest yes for hiking with a dog. Most systems welcome a leashed dog right on the trails, which is the opposite of how the national parks tend to work.
Here is one well-known, dog-friendly state park in each state to get you started, pulled from the most popular parks we have verified. Every one allows leashed dogs on its trails.
For the full list in your state, follow the link to that state's guide.
Every state has dozens more. Your state guide lists the top parks, each checked for its own dog rule.
Almost always. Most state park systems allow leashed dogs on their trails, while most national parks do not. State parks are the better bet for a real hike with a dog.
A 6-foot leash is the common standard, though a few states allow 8 or 10 feet. Dogs are typically kept off swimming beaches and out of buildings.