Nope. My neighbor runs a rescue for dogs and she has Harley, a great dane mix that weighed 240# when she got him, he bigger than this dog just by looking at him.
When he is in the kitchen he looks DOWN on the counter, my son was playing soccer there with their kids and Harley could mouth the soccer ball, he got his mouth completely around it. They had to quit after chasing him around the yard to get the ball back and it was a slobbery slippery mess.
Well, DO have her send pix of Harley (with tape measure) to Guinness. A dog that big, you could ride.