boomerang wrote:His job is to chase off interlopers
seriously? then he really shouldn't be a house dog
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ok, so you messed up letting him be in a place he could chase and tree a raccoon. he knows that he can make raccoons and people go away if he barks (sometimes the people were going to go away in any case but he doesn't know that). he's found something he's successful at, so you've got to replace it with something.
Definitely don't reward the barking by any kind of attention - other than distraction. Do you have him on a collar and lead in the house? you may need to do the Cesar-tug to distract him when he starts barking.
Generally, how are you doing with training and Diamond? have you got the whole boomer's the alpha dog thing happening?
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sidebar: the raccoon trying to get in is a bad bad sign - those things are wicked wicked fighters. Be really careful about Diamond being outside without you til you get the raccoon outta there.