My lab x border collie is about to turn 1 year old. I have gone through some rough times with him and just when I thought he was settling down I am now wondering about some of his new behaviour. 1. We live on 5 acres and what we originally thought was our boy just exercising has become an annoying habit. When he sights a car, truck or sometimes pedestrian he will charge down to the fence line and run at full speed along the fence line as if he is racing the car, barking as he approaches the end, he is not aggressive. If he is at the other end of the property and sees a car coming up the road he runs at full speed to meet it. He does the same with us when we are leaving our home. When my husband is on the ride on mower he will just run up and down behind him for hours on end, tired of course but this does not dampen his spirit. 2. He has begun sniffing at our visitors, male and female's bums and crutches it is so embarrasing. I find that he becomes excited and when he is told to sit, which he does, he has a pink 'dick' looking at us. This is a regular occurance. Will desexing help to stop this? 3. When our boy is outside with us he will often come and sit at our side, he will raise his paw and constantly paw at us. I will shake his paw or give him a pat on the head. This seems to then excite him and he may then jump. Otherwise if I ignore him he will repeatedly paw at me or begin to bark. 4. Finally I am concerned as we occasionally get kangaroos on our property. Recently we arrived home from work to find that our boy had obviously been chasing them and with exhaustion they had died. We found one which he had started to eat. I did not get angry with him as I thought this is his space and it was after the event. He ignores the kangaroos if they are on the otherside of the fence. Should I be worried? How can I stop the above behaviour, sorry about the list - all help appreciated.

Annette