In this forum I am obliged to tell the truth, so I must admit that my Patronus, when fully formed, is in fact a wolf. I will never forget the first time I saw it. It was, for me, just another reminder of my "condition" that I tried so desperately to hide from the outside world. In my youth, and for most of my life, the wolf and I were locked in a constant battle. I decided I would not allow its appearance to give me away so easily.
Through much practice and determination I learned to produce Patronuses which, while powerful, did not take animal form as others typically do. Although I could nearly always see its eyes, watching me from the orb of light within which it was contained, its true nature and full appearance was well-hidden from others at all times.
Although the result was cause for stress, one of my most powerful and happy memories, which never fails to conjure a Patronus, is that of my father, Lyall, something of an expert in the field in his time, who spent many an evening after work teaching me how to produce them.