I love the idea of having an up to date tracker, but the monthly fees are humungous- I like also that it sends an alarm to your phone if someone is trying to remove your collar or out of the area the dog should be in. Great technology.
What about those little chip thingies you can plant in your OH's phone/car/wallet if you suspect he's going where he shouldn't? You could stick it in the dog's collar. Can't remember what they're called but google came up with; http://www.themobiletracker.com/english/index.html