Montana State Parks Pet Policy: Pets are welcome in most Montana State Parks, but must be kept on a leash no longer than 8 feet, unless otherwise posted. Pets are not permitted on swimming beaches or any other areas that display posted restrictions. The following parks don’t allow pets at all: Lewis and Clark Caverns (pets are not allowed in the cave, but a kennel service is offered during your tour); Frenchtown Pond; Wild Horse Island; Smith River (pets are allowed only at the put-in and take-out if they are on leashes, not on the float); and Spring Meadow Lake (no pets during 4/16 – 10/14, pets allowed on leashes during 10/15 – 4/15).
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