Little poodle big problem, need advise

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I am usually very good with dogs but I so Spoiled my 3 year old toy poodle that this problem is out of my contrl. I love him almost like a child and he loves me soo much.maybe too much.he goes with me everywhere in the car in the house outside in bed,EVERYWHERE.Which is fine because he is a very good boy(Linus).he listens to me always except on this one thing. He is so possesive of me that he attacks the other dogs,constantly growls at them,he has recently started growling at my boyfriend when he leans over me,kissed me or gets close,This is not as severe as with the other dogs though. I am planning to get another toy poodle puppy and i know linus behavior will interfer with our bonding as he has with my last two.I really want to bond well with this new puppy without making linus feel bad or neglected.i love him too much but how do i improve his behavior?how do i protect the new puppy from attacks and bond with it. My current dogs are actually afraid of him and i just dont know how to stop it?? any suggestions would be greatly appreciated.