Vegan dog biscuits are good! If you go on thekindlife.com there is a forum about vegan dog foods...
As for race horses, we actually have a former race horse (6 years old) who was too slow... Around here they are usually given away if not sent to slaughter. We have a friend who is a race horse trainer down in Pau, and were fortunate enough to visit his yard.. He DEEPLY cared for his horses and they were well looked after.. He had one who was too slow but hadn't given him away because he cared about him too much, he was one of the most gentle colts I have ever met! He offered him to us as all he cared about was that he got a good home (though we didn't end up getting him). So I think it depends on the trainers.. I had to do a school report on the horse meat scandal, and it's true that it was most likely race horses used
My mum used to event and now we are turning a race horse into a competition horse for the two of us, so I wish more people would do this as Red is one of the most gentle horses you could ever meet
Both my horses are 'rescue' horses of a type. I have Zeus who is a 5 yr old off the track TB, who I bought him from a racing stable as a 3 year old as he was 'too slow' and Jo is a station bred horse who was rescued as an abuse case... he has some serious mental issue that we're still working through 7 years later..
We don't have a problem finding people willing to take on ex-race horses here, but we do have the problem of the racing industry putting ridiculous prices on their too slow, completely uneducated horses. But this is all very off topic lol
Oh and I forgot to mention lol, Zeus will eventually be competing in Eventing with me If he likes it of course