He claims to be a mix of a collie and a Growlithe (fire-breathing dog Pokémon). Unlike Fire_Mutt, his sister Karma has no Fire-type powers.
Fire_Mutt has written 2034 comments over 1642 comics and has received 156 likes, meaning he gets a favourite every 13 comments on average.
The last comment Fire_Mutt wrote was on comic 4130, remarking "If you thought depressing comic week couldn't get worse..." for Depressing Comic Week 10. At least six people have recognised this and paid their respects. Fire_Mutt has been inactive for 473 days as of the 14th of March 2017.