Barking

Reuben isn't a prolific barker thank goodness , but recently he has started to bark when excited or aroused in any way . He doesn't keep it up for long but I would like to nip it in the bud if I can , before it becomes a habit , any suggestions gratefully received x
 
Just adding , this isn't barking when someone comes to the door , this is barking just because he is excited , and sadly I have neighbours who do not like dogs and so I don't want to give them any ammunition ! x
 
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