Your dog is very lucky you work at home. Be prepared for your productivity to drop with a playful pup around. <img src="/images/graemlins/smile.gif" alt="" />
You might try taking your dog for some training classes. A professional dog trainer should be able to give you some idea of what you're dog is capable of and will be able to read whatever signs your dog is giving when he barks.
Good luck!! Let us know how it turns out and kudos to you for rescuing a shelter dog!
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"When I read about the evils of drinking, I gave up reading." Henny Youngman