So I've been watching this mod develop for a few months now, and I have to say that I was super interested in having actual livestock implemented into Minecraft. But I can't help but to notice you seem to be spinning your wheels a bit, which I feel like would be a safe bet to guess is in due part with your "coder" who doesn't seem to actually be around to do the code.
That being said, this mod is very similar to something I had been wanting to do for a long time. Unfortunately I never got around to making models and such for it due to my other mod taking up so much time. However if you would like to see this mod actually take off, I'd be tempted to make the code for it. I certainly don't mind bringing this mod to life, as long as you and whomever else are willing to do the models, as I don't really have the time to do the code AND the models.
Although..I do have a few conditions. The major one being the version it is made for. 1.7.10 is more or less a dead version now, and there is no point in making it for 1.7.10. There are also many major differences code-wise between 1.8.9 and 1.10.2, and so I would rather not downgrade to 1.8.9 either.
So if you are okay with this mod starting at 1.10.2, then I'd be happy to move up this mod's first release from...whenever your coder decides to actually do something, to having it released in the next few weeks.