when one thinks of fetish in the first place, you can almost always find an answer not in biological but in the psycological reasons.
fetish tends to arise in the earlier years of life, when habit and concept develop before you are able to understand the reasoning behind the things you do.
when it comes to furries i find that a lot of the time, they are people who experienced a traumatizing moment in life and when no one was there for them, a pet or a form of wilderness was available for comfort in some form.
i have a friend who makes a wonderful example. When he was very young he grew up in a household where the father left them, and his sister died, and through all of this he had his dog, and the social connection he was able to make with the animal, on a much deeper level, impacted him to associate with animals. i feel that this is the case for many furries. some where in their life they experienced some heavily emotional or physical impact that hurt them and an animal was there for support. That is why you find furries acting out the animals they enjoy, because they feel that they communicate the best this way, the way their support does, the way that their "bestfriend" does.
many fetishes seem to be this way, and an excellent example is S&M a heavily popular fetish, one that i explore myself. and i find that the same is true there but instead of animals, the S&M community finds capture and attention the filler for the hole in their developed self.
so once again you have child growing up in troubled home, no attention, no real sense of love or comfort, no one wants them around, and then later on in life, they find some one who wants them more than anything and is willing to give them praise and attention, and even go so far as to tie them up and keep them as their own. and there you ahve it, the perfect S&M couple.
in any case i find this to be the most reasonable explanation for those kinds of situations, or questions. fetish is amazing, and the reasons behind them are deep seated ideas, that should not be shunned in culture, but (in cases that are not harmful to children or unwanted) should be embrased as healthy outputs for difficult to deal with emotions many people have to grow up with.
now what would be even better to think about is self bondage, wonderful discussion topics.
