Poor Indy and poor you, it was just an accident. I'm also surprised that it hasn't happened to Gari before either as like most of our Cockers, he is always around when their is cooking being done. I'm scared to cook on the front gas in case anything falls on him, and I kind of side-step along the worktop carrying pots to the sink.
Don't be so hard on yourself, Indy has forgiven you, and hopefully it will just be a monor burn. Like Cob-Web said, maybe see if you can spray some cool water over it.
Hope Indy feels better soon.