Callahan State Park is a 820-acre day use area located in Northwest Framingham. Callahan has seven miles of marked trails and is used for activities including fishing, hiking, horseback riding (horses not provided) and cross-country skiing. Within the park are nearly 100 acres of open fields, 70 acres of which are currently under an agricultural lease.
very nice and moderate walk. I've been going there since I was a child. in my opinion best dog park I've ever been to. on holidays there could be almost a hundred dogs. on a normal nice day there's a good number. big fields for dogs to play in. a sexy green (ew) pond for them to swim in and a few miles of very nice hiking paths. they even have bike paths on the left.