On regular graph paper the snout looked WAY too long to me, but when I did it on knitting graph paper (that I printed from computer via website) the same count looked "normal". IMO, I would just go for it and if you get to a point where you think it is long enough, even if our "design" chart says to add more rows for the snout, forget about it and go on with the rest of the head.
I looked and looked for the burnt orange yarn as well. I wanted to make mine in 100% cotton for dishcloth and, to be honest, didn't want to pay a bundle for just a little bit. I did find several "burnt orange" yarns out there (look under not only "burnt orange" but also "spiced orange", pumpkin, sunset... these were some of the names I saw attached to colors that were appropriate for a UT Longhorn fan. BEWARE though, some pumpkins look ORANGE while others look "right". Same with all the colors.
That long ramble said, I decided to do an ecru cotton dishcloth. I'm debating on doing a white longhorn OR taking a stab at trying to dye some of the cotton yard to a "burnt orange" color to use. Needless to say, my indecision is stalling my knitting.... I'll definitely keep you abreast of what I do/find.