When there are no rangers on Squaw it's not uncommon to see multiple dogs over a course of several laps, in season. When it's hot I'd guess around once a week. Comes in waves, I've seen two in the past three days. Less common late afternoon/evenings.
Half sort of don't care, the other half really don't care. I can't remember seeing any on the summit. It's pretty rare to see them past the half. Some of the regulars are just raring to vent pent up anger so it kind of balances out.