8 month old puppy suddenly aggressive towards Rover newcomers; what should we do?

asked 2019-08-12 20:08:11 -0500

We have been using Rover to walk our 8 month old puppy for over 4 months now. He has always been perfectly fine with people coming into the house to walk him but now is being aggressive with newcomers. How should we handle this? Should we stop using Rover altogether and fine someone who is consistent?

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