It could be because some people dont fallow the rules, it
could also be because they cant think of any thing else to
make, now I dont know this for sure, Im just guesing.
Another reson is becouse they COULD be very passonit about
that animal & they want to show it. I showed my passion for
how much Balto loves Jenna in my fan image. Like I said, I
dont know for sure.

I think that those are only allowed because it's one of the
artists characters as whatever kind of animal. I have
noticed this, too, though, and it's kind of annoying.

The fanart rules are here, you will find your answer there
:

http://baltosource.timduru.org/board/ftopic1727.html