I look for a "Look" first. I like the pup that sees the cat like all the others in the litter, but don't go nuts like the rest, but don't act scare or stupid either. I like a confident acting pup.

I look for structure and movement.

After this, I'll look for dogs that possess the traits of that family, if I know them.

Last, I'll consider color.

As I go down the list, I'll use the next to break the ties of the previous. If that makes sense.

I picked my Amos dog this way. He was a pure Tonka Red Baron dog. His entire litter was reds and blacks. Most of the TRB dogs I knew of that were great were typically more solid in color. I picked out a solid red, black nose dog with great structure and attitude. There was one more solid than not, red bitch as well. Very similar to him. They were the two best dogs from that litter. It's one of the few times the color really panned out for me.

If I had any advice though, I would go with structure and movement first. Great place to start knowing nothing else.