I would think a decent sized terrier might have a better chance on its own than a dog bred for bird hunting. Bird dogs are bred to work with a hunter under the gun and to have soft mouths. A bird dog with a tendency to kill the birds would be a liability.
Most Terriers are bred to be self hunters and tenacious. A plus in wild conditions.
A dog that was born feral rather than a pet who suddenly found itself alone without a human would be two completely different situations and the outcomes would be different.
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"I've been fleeced 
A well trained dog will make no attempt to share your lunch.
He'll just make you feel guilty while you're eating it.
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