I generally give it a scraping pre fire, fire it up and then a scraping after it's hot. Not sure my pet would like a hot lick. I should mention I have a cat, not a dog. There is a very cheap joke sitting there and I'll leave it lying where it is.
The onion and lemon method is interesting and I'll have to give them a try. As I mentioned in my OP foil just shreds on the cast iron grates. Those that keep mentioning it, are you using foil on cast iron? And if so, what kind of foil do you use that doesn't shred? I ended up with hundreds of aluminum flakes the one time I tried it.
jb