1. Too much of a good thing..whatever that thing may be usually turns out to be a bad thing. Thus, it's important to use common sense, good judgement, and, if you have it, previous experience when making decisions. And considering you do not know my 3 year old personally it's not your place to say what his best interests are :)
2. Day old bread-something I heard, something that each responsible horse owner, if considering, should talk to their veterinarian about or do their own research on. :) I though it was quite an interesting bit of ifnormation when I first heard of it.