Dog Run

Hmmmm, was this a good idea? I have fencing for the dog run now, but the size of the concrete attached to the posts is unbelievable, the bolus of 'crete is as large as I am, well, at least as heavy.. I tried hitting them with the maul, but it barely makes a dent in the stuff. I am sure if I had a concrete saw, it may help. Or just plant the dang things.