for Jack!  I dont know if I agree with this.  It seems so....well...mean!  I guess I should tell you what is going on.  Well, Jack used to bark at kids when they would come to our house.  It was frustrating because my 7yr olds friends were scared of him.  So I worked with him and he got better.  Never was in love with kids, but tolerant.  I would just tell the kids to let him come to them, pet him and talk nice to him give him a treat and dont bug him all the time.  It was going well.  Well, now he barks very viscously sounding to EVERYONE who walks in the door.  I've squirted him with a bottle and it works...for the moment.  If I know someone is coming I put him in the utitlity room away from everyone and slowly introduce him after the person is here. When he sees the person...off he goes toward them sounding like hes about to kill.  My 19yr old step-daughters friend is scared to come in our door because he acts like he is going to bite her.  She opens the door and if Jack is coming at her she stays outside until I get him put away.  My husband said he's worse about it when I am here, that Jack listens better to him when Im gone.  Im the ONLY one Jack doesnt bark at when I come home.  Let me make myself clear, he's not just barking hes snarling.  My mother in law was afraid to come in the other day because she thought Jack was going to bite her.  I know I've had a similar prob with this before, and I thought I had him under control, but he seems worse now.  My husband is afraid that he will bite one day and Im kinda worried about that too.  I think its time to consult with Ceasar Millan! 

I know I've asked for help for a similar situation before...I guess Im wondering if he will ever get over this or if I will have to work with him constantly.  And any opinions on shock collars would be apprectiated....tho I dont know if I am for that idea.

Acccccccccck!  Shock collars!    Try citronella spray bark collars - they work great for me.  I have 4 of 'em... much more humane and very effective. 

Here's one on Amazon.Com for $35.00 - I just bought one recently myself:

http://www.amazon.com/Premier-Spray-Sense-Anti-Bark-Collar/dp/B0002D31QU/ref=sr_1_1?ie=UTF8&s=home-garden&qid=1223048164&sr=8-1

Please try this one first before going to the shock collar!!

Those shock collars are terrible in the hands of the untrained... BUT....Those citronella ones sound pretty cool. (Keep the fleas off too!!!?? HEH!)

I recently saw a Victoria Stilwell episode on just that. Their dog lunged  & barked at and even nipped people....and barked and snarled. Guests were afraid to come in.

She had the "pack-leader" of the family keep the dog  on a long lead at all times...then had people enter....and toss pieces of savory chicken to the dog while walking past (dog was firmly held on lead), and with NO eye contact. Eventually the dog associated guests with treats. (They eventually substituted tossing treats  with praise.)

IF the dog lunged or barked, etc he was immediately removed from the room. He soon associated his isolation  with his behavior....smart dog!..(Edit ....to add that she would remove him for just a few minutes, then go get him...this she repeated many times until he finally entered the room and behaved) YAY..."EDIT" is back!!!!!!!!!

I don't know if it was just an act for TV, but it appeared to have worked..at least when the cameras returned, 2-3 weeks later, the dog was a totally different dog.

Also....The owners had really worked hard with him....using her techniques.

I agree .... a trainer (behavorial) would be a great help! She,or he, could help you learn different training methods that fit your dog's personality and needs... and your homelife. Hope it works out for your cutie!!!