I've never seen a cairn with both brown and blue hairs mottled together, but that doesn't mean they don't exist. Cairns do carry the genes for either color.
Whenever I try to guess a mutt's ancestry, I look at their ears, coat, tail, size, and snout - it's a highly imperfect method, but it makes me feel smart. lol.
At that size, his ears, coat, and snout say "terrier" to me. Maybe Cairn, or Norwich or Border or Yorkshire, given how perky and upright they are, but he doesn't look like any of those breeds to me. I'd guess he's some kind of a mix, probably some chihuahua in there, too.
Whenever I try to guess a mutt's ancestry, I look at their ears, coat, tail, size, and snout - it's a highly imperfect method, but it makes me feel smart. lol.
At that size, his ears, coat, and snout say "terrier" to me. Maybe Cairn, or Norwich or Border or Yorkshire, given how perky and upright they are, but he doesn't look like any of those breeds to me. I'd guess he's some kind of a mix, probably some chihuahua in there, too.