Random article is random lol. It doesn't seem to be talking about anthrocon, just furries in general as a whole. good going I guess? :p
What's a 'furry', you ask? Well, that's a fair enough question. A furry is a person - to quote Wikipedia for a moment - who likes to dress up as a "fictional non-human character with human characteristics".
That is to say, a person who likes to dress up in a human-like wolf costume (or the like) and have a load of fun whilst wearing it. There's no denying that's a smidge odd, of course, but what's important here for these furries who go to furry conventions is that they're obviously having the time of their lives.
To show you what we mean, here's a video from last year's 'Anthrocon' at Pittsburgh, Pennsylvania, which shows a group of more athletic human beings (in their 'fursuits') giving it some on the dancefloor to the tune of Missy Elliott's 4 My People. As you do.
And for some animals behaving like humans, here's a video gallery of some cats and dogs and so on pretending they're one of us. N.B. None of them actually breakdance. Sorry about that.