The human-horse hybrid was chosen for my affinity with equines and the reason for the hybrid is from the book, 'Destiny's Change'. I'll leave it at that, you'll just have to read it and see. Hopefully my publisher will throw that eBook conversion offer my way again, now that I have the scratch to put out the money to have it done.
I can simpathise with your arthritis - I too have it bad in the knuckles/hands and one knee. I've also been plagued with lower back issues, the last one being sciatica. Lost 7 weeks of work over that. I might retire at 62, so that would be in five years. I'm in that boat where I'm not sure I can make it to that age.