Kinksters and fetishists typically use non-human partners essentially as a living sex toy with little to no consideration given to their wants, dislikes, pleasure, comfort and happiness on a level equal to or above their own, which creates a very unhealthy power dynamic and a much greater possibility for rapey behavioral tendencies. You see that shit all the time in old commercial zoo porn. It's all just one step above rape as far as I'm concerned and a lot of it IS actual rape. There's obviously just as much "grey area" here with zoo kink and fetish as there is grey area in human emotion and levels of attraction. But thought dictates behavior in one way or another, and that can lead to force being applied in the heat of the moment when the non-human partner isn't doing what they want them to do and the person is getting increasingly desperate to finish and cum. That's just one of many reasons why I don't like fetishists and kinksters into zoo.
It's not right to use another being to get off even if no apparent harm is being done. Force or restraint of any kind is rape, and unless the foremost thing on your mind is your non-human partner's happiness, pleasure and well being, there's risk for mistreatment.
On the other paw, if there's a genuine sense of love, equality and caring for them and their well being over and above the typical "pet"-"master" relationship, which your relationship seems to be, then its not kink, it's not fetishism, it's not using them. You're mates and it's your sexual and romantic orientation and something to cherish. Unless it happens to be a trauma-response from childhood sexual abuse, then it's something that should be healed. But that's a whole other conversation.
