It's rewarding. Done it with 3 dogs, 2 newfs and 1 pyr. Linsey is retired and currently have no certified dogs. Like I said it can be rewarding but I think the dog's personality has a lot to do with it and you contact people that if you let it affect you can be truly sad. My other 2 dogs I have I would not certify, personality I don't think is cut our for it. Dogs can't startle from noises or like thinks like wheelchairs. These 2 have a tendency to be more noise sensitive and startle. And I truly have too many other irons in the fire that time was a great factor.