Is he under winter coat? If he is then it may be hidden right now. I do see some tiger striping around the legs and a dorsal stripe... I'd have thought dun if I saw him right off but maybe the brindle is hidden under his winter coat...?
Did you look at the pix on the website? http://www.airliefarm.com/webpage/index.php?pg=sale
I still can't really see it though... :(