Well, as an upsate for all who read the post about the horse we had die on us after only 2 days of having him, and with no apparent reason as we could see. It had baffled us for a while, and we finally have an answer.
Apparently he had a blood clot that moved to his brain. This would explain why he stumbed around and didnt die immediately, etc.
*sigh* it sucks that it had to happen, but atleast now we know why. RIP Canvas Master.
I'm very sorry to hear about your loss, and glad that you at least got some answers. Clots can come on suddenly and sometimes with out reason, cause, or warning. What a tragic occurrence. My heart goes out to you.