Where Can I Get A Mix Puppy Cairn Terrier And West Highland Terrier?

Cairn terrier and west highland terrier are best dogs and many people like to purchase these pets as their home pets. You can get these pets from this website.
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You can't because Westies are just white cairn terriers. Westies descended from the Cairn terrier. So if you mix a cairn terrier and a westie it would be the same as a Cairn terrier or a westie depending on the color. I'm pretty sure it would still be a pure bred of either one of the breeds.