My tortoises, chameleons and bearded dragons all have secure outdoor enclosures (although not child proof!) - I don't leave them outside overnight, but I've never had any problems (other than children with short-term memory loss).
Years ago, we had an iguana - my husband put him in the kiddy pool not checking the temperature first. well, poor 'Darwin' swam as fast as he could and scooted into the tall grass on the other side. Our basset pup ran in after him and brought him back out - 'Darwin's' head down 'Watson's' throat. He dropped him at my feet - not a mark on him!
So... my rule is no herps loose outside unless they are slow and large enough to find easily - even the hatchling torts can move at a fair clip and can be hard to find.