I pass a race when I don't see a reasonable way to make money wagering on the race. Typically this is when my vision of the race is just like the public vision. A race where my choices could win but still not yield a reasonable profit. I should note that I may still include these races on horizontal wagers.
Another type of race could be when there a too many unknown factors. For example, there may be larger number of FTS. Once again this race could still be included in my horizontal wagers.

@Tony Kofalt
Agree Tony! Knowing when to pass is as important as knowing when to play!

4) multiple foreign horses in races (excludes Breeders Cup) — Conley

Do you define "foreign'' as having only foreign races showing or would it include any horse with any foreign races showing? For example, if a horse has one North America race showing and the rest are foreign, would you consider it a "foreign" horse?

Everyone, do you pass on wet tracks?

I pretty much pass nothing. LOL

I play races differently, but I believe there is always a way to leverage a bet out of a race.

Must admit, that this position is getting tougher to maintain.

Ranch, I do not pass on wet tracks. But as someone who plays primarily horizontal wagers, I find more fields scratch down on these surfaces. I have to be careful with the prospect of short fields.

@RanchWest,
I rarely pass wet track races simply because of the wet unless they're on wet turf and don't get taken off .