Intoducing the new dog

[raycie]

Yesterday we adopted a new puppy/dog (violet - Rott mix) and were in the process of introduing our current dog (Bailey - Border Terrier / Shitzu).
After coming home, we thought that a nice way to introduce Bailey to Violet, was to keep violet in the car and in the travel kennel, and to bring Bailey to sniff Violet while in the kennel.
I guess Violet was in the kennel for long enough to think of that as "her" area, and so snapped at Bailey when she got close to snif the cage. After she snapped, we corrected the behavior verbally.
A little later, we went walking, Violet with me, and Bailey with my wife. They walked fine, we separted them while eating, and later in the evening, I brought Violet (on a leash) into the house.
While in the house, she had god interactions with both Bailey and the cat. The cat was the one who was the most curious. Bailey on the other hand, doesn't like bigger dogs too much.
This morning, when the dogs were left together for a little while, my wife noticed that Violet was getting into a stiff crouch-like stance, and stopped the behavior.

Are we doing this totally wrong? What would you think about a muzzle for violet for a little while when she is in the house, as to not let her get too nasty, but get the interactions going?

Thanks in advance..