Hello! My handsome English Mastiff - Clay (@claythegentlemastiff) - is having knee surgery and I am uncertain on what kind of sling would work best for him post surgery. It will need to be large enough for us to assist him in walking while he's on the mend. He's about 210# and I'm having a hard time finding one that will hold him. Any assistance is greatly appreciated! Attached is a photo for your enjoyment. Thank you!!