My boyfriend have a 90 lbs Lab who is alpha dog. And Daxter is dominant also. We have been putting off to introduce them together because he is afraid that his dog will eat mine. Daxter like big dog, and Nebb - the lab does not like small dog. What is the safest way to introduce them for the 1st time and make them get along or at least can tolerate each other if they are in the same room and not fighting?

Sorry I can't help as I only have one dog.  I am sure that when Nora, the training moderator, sees this she will offer you some advice. 

the best way is walk them both and let them meet on neutral ground but leashed, this way you have control. NEUTRAL ground is always the best place. Have your boyfriend walk his dog and you walk yours and come up to each other and see how it goes. You can then walk together to someones yard and supervise them.

are they both fixed??  There will be one alpha, even thought they both seem dominant one will take the alpha role and you both must support it.

Watch their body language, dog fights won't happen without warning. Look to see if their tails are wagging or stiff. Are their ears up or back? You can learn a lot, if  you here growls seperate them. maybe they will have to get used to each other through a fence. If tails are wagging and the meeting goes welll it will be easier each time.

No Problem Monica, I just seen this. Nora will probably have good advice to add to.

I think this, both walk them come from opposite ends of the street and let them greet. They will be leashed so if anything ugly happens you can get them apart. I serioulsy have found I worry more over my 2 meeting new dogs than they do. Remember they are pack animals are for the most part do better in pairs.

That is good advice, I find when I first got Alice and we tried walking them side by side she would growl and Fred sometimes when they bumped. It may be dog to dog but she does better with distance when meet and greet than side by side. This is just how we introduce them, just watch the body language and you will know what they are feeling. Good Luck!!

I mean boyfriend and Monica walking next to each other and the dogs distanced by 2 people but still side by side, eventually move them closer. Since so many dogs are leash aggressive, face to face can create a problem when maybe there wasn't one to begin with. Nebb might just be leash aggressive and your boyfriend is misreading the source of his agression (fear, tension, etc) and thinking the dog wants to bite another dog when he is just not being told to behave a different way on leash. If he is leash aggressive, then bring another dog toward him from the front certainly will create a problem. If you or he are really worried, muzzle the lab and let them get the initial meet over however you choose to do it, but if your boyfriend "thinks" the dog will bite another, then he is not going to help the situation. If his dog is muzzled, he will at least eliminate that chance in his mind and be more relaxed about the initial meeting and therefore doing all he can to foster the right response in his dog. You could also walk the dogs separately to release energy, then have them meet on neutral territory with his dog muzzled (if it is necessary for removing human's tension or anxiety from situation).

It's possible to have a dominant dog that is not an alpha dog...

Dogs are pack animals and, as such, have a unique communication system they use to deal with group living and interaction. It is best to introduce unacquainted dogs to one another in a neutral area with each dog on leash. If the dogs' behavior is calm, they can be allowed to smell each other nose to nose, and nose to genital-anal area. It is important to be alert for key body postures and facial expressions that indicate the dogs' reaction to the encounter.  

A subordinate or fearful dog will lower the head, hold the ears back, tuck the tail between its legs, and not make eye contact with the other dog. One dog may exhibit extreme submission by slinking along the ground, lying down, and lifting one rear leg and exposing the abdomen. An aggressive but subordinate dog will probably bare its teeth, but will hold its ears back and its tail down and be ready to flee. A dominant dog will hold the tail high and perhaps wag it slowly. This type of dog will establish eye contact with the other dog. Growling, snarling, and barking may occur!  An aggressive, dominant dog will also bare the teeth and raise the hair on its back in an attempt to threaten. A playful dog will place the front end of its body down and the rear end up (a canine posture called a play bow), emit a high-pitched bark, and wag its tail.  Watch for these signs in the dogs.... and yes Christine is right -- walk them together.,