Done correctly, house sitting can be a rewarding and lucrative job. By reducing rent, providing extra pocket money and allowing an extended stay in an inviting home, house sitting is ideal for students, people on the move and those looking to pick up extra work that's low-key and stress-free. But there's more to house sitting than meets the eye, and a few gaffes could cost you your job and your reputation as a great house sitter. Next time you're house sitting, avoid these three blunders.