A couple are forced to warn everyone who visits their home to be careful when sitting down or they may get trapped under their 12-stone dog “Hercules”—who thinks he’s a lapdog. Hercules, a 2-year-old Saint Bernard, is blissfully unaware of his enormous size as the “loveable goof” enjoys nothing more than sitting on people’s laps for a good cuddle. But once the huge 161 lb. hound plonks himself on someone’s knee, there is no moving him until he decides he’s had his fill. His owners Katie and Nick Bridge, both 29, regularly find themselves stuck under their colossal canine for so long that their legs fall asleep. And the parents-of-one even advise house guests against sitting in any of Hercules’ favorite spots unless they’re ready to “brace themselves” for the mammoth mutt’s weight. “Hercules definitely thinks he is a lapdog but it’s like having a fully grown man plonked on …