Here is a heavy duty metal cage with plenty of space for dogs. The Homey Pet 49″ Dog Cage comes with plastic floor grid, pull out tray, and feeding door. It can fit dogs up to 150lbs. With the lockable heavy duty casters, you can move the cage around more conveniently.
This cage measures L49″ x W 37″ x H44″. Costs under $400 at this time.