Any words that would generally be allowed in a G rated film are probably ok. (For those in other places, anything that as a parent you would feel comfortable with your children hearing when they are still before teenagers). Darn, heck, and blast are also generally considered safe. Any of the classic four letter words (starting with S and F most commonly) and variants should probably stay out of a general forum. Just my take on things. Mahray Darn it all to heck!

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Ignore the shooty dog thing.