Unfortunately I don't have another pic. I saw the picture above on a post, and got me curious. I love brindle mastiffs, but am looking for a slightly smaller version (and the picture looked exactly like what I've seen before). I guess I'd describe the dog somewhere bigger than a lab, but smaller than a mastiff.
So many different breeds and mixes can come in brindle that you really can't make a guess from that picture alone. My muttly mutt is brindle and my best guess is that it comes from plott hound for him but could be any number of breeds.