Ha, count yourself lucky! Usually this type of argument is used to defend Loli crap, for example. You know, the characters that ACTUALLY look like 6-year olds, but then it's argued that "they're akshually very old spirits inhabiting the body and blahblahpedoshitblah."

I have to admit though that I've never seen it in furry-context, though that could be because I don't really get into contact with the community much, so yeah. Like I said, it was a gut reaction, nothing to do with the linked picture itself. Note to self: think before you post! ;)

Perhaps "physically" is a better descriptor than "canonically". "Physically and mentally" if you want to be thorough.