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@kl
Definitely don't think it's just just scent, as mine recognise them from a great distance and react immediately on sight, no matter which way the wind is blowing. They'll react when the fox is stock-still, so maybe not movement either. Possibly (probably) shape, but foxes are pretty dog-shaped, and they don't react to 100 other different flavours of dog shape.
Don't even think they want to catch or hurt them. They just enjoy a bit of a chase and come back. Strange little innate instinct they have. May go back to generations of training to guard livestock and being bred to recognise foxes as 'the enemy'.