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Have you taken him to the vets? Sometimes dogs can become stressed if they feel unwell, and this can lead to aggressive behaviour.

Has he been attacked by another dog while out on a walk?

There could be so many reasons for this behaviour, it's best that you see a professional.
i cant say anything more useful that what border collie here has said. :thumbup:

best get him checked to see whats going on ;)
 
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