I drive home every day in the tractor too have lunch and iam in the town and my neighbour has witnessed this as well they can recognise between tractors they start the odd yip and bark when iam a quarter of a mile away yet tractors go past all day and they don't make a noise and here is the kicker sometimes I use the pushbike too work and back and just as iam getting round the corner on too my street coming home they start funny thing is they never used too bark at all till a couple of years ago funny old creatures dogs are