Jamieson's Liberty in Kant

I find Jamieson to be very reasonable in his argument for liberty. Animal liberty itself seems to be a foreign idea to my mind. This is probably due to the fact that I think myself human and forget that humans are also animals. If I have the liberty to pursue my ends to the best of my capabilities like my fellow humans, then why shouldn't other non-human animals not have the rights. Certainly, we can for the most part agree that it is wrong to use others as a means to an end because in doing so we leave our selves to the same circumstances. This would not be liberty because I am always at odds with others for control. At moments I will control and in other I am being controlled. So it is better to treat others as ends in themselves to avoid such cylces of ups and downs. Likewise, we should habituate our selves in this practice towards animals, not because they can reciprocate this treatment; rather, it is so we can be able to attain ethical consistency for its own sake.