My four year old Aussie Jasper seems to hate trucks. He is my constant companion and rides in the back of the car with a seat belt. If a truck approaches (oncoming) he barks and nearly has a fit. This only happens on two lane roads. No problem on interstates or divided highway. When this happens he is totally single minded and verbal corrections are ignored. This also happens when walking. I have always put him in a 'sit' when a vehicle approaches and he will stay unless it is a truck then he will break the sit/stay. Any suggestions on correcting this behavior will be appreciated.
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