Corners are optional!
This toy feels quite firm and is the kind of spongy foam texture my Golden retriever/Lab X loves. And he still loves it... just in bits!! He had the corners off in minutes (with me trying to get it back in the same timeframe) but I left him with the ball and that is still going two months later. So for strong jawed pups that like to chew with their back teeth - they'll love it, but don't expect it to stay intact!!