When I say the word park my dogs ears light up.
Are you sure this is why his ears light up?
Yes it is. It is like he can understand me.
It is always cool when you find out new ways to communicate with your pet. Dogs are truly smarter then you would ever think, and when you are able to train one you get to see it first hand.
It took a while to get to this point.
That shows how much time you spent working at this with your pet. The bond between pet and owner is an important one.