Is having fun a reinforcer to the dog?

This topic came up at the ORCA seminar as the panel question:

 Is the trainer having fun a reinforcer for the dog? 

I believe, with no data behind it - that the handler having fun is absolutely a reinforcer to the animal. But I also believe that a dog that is positively reinforced, therefore a "happy" dog (tail wagging, focused and with desire) is reinforcing to the TRAINER! And if you have both ends of the training having a good time, how could it be anything but successful?

"The science of dog training is important, I never allow that to be far from my mind but please don’t allow the science of “why” take away all of the joy you have when you train and live with your dog. Being aware of what is going on is the first step, then gradually replace those you don’t like with those you do. I can’t tell you how many times a day I laugh out loud because of something one of my dogs do, please don’t ever lose that."

 ~~ Susan Garrett  (http://susangarrettdogagility.com/2012/03/dont-forget-to-laugh/)

Well said Susan! How funny that she posted this in her blog after just hearing this question at the seminar??

In agility, those handlers that have a smile while they are running - whether it is a good run or not - seem to be the ones having a good time. That is MY GOAL --  Smile at my dog, run with intent and laugh no matter what the outcome!!