Shooting p-dogs was where I learned my "hashmark infatuation" was misplaced.
The wind is invariably too, well, variable. It is constantly changing from 25 mph down to 18, then 12, then 26 again. I would no sooner get the 5th hashmark over lined up on the dog than the wind would change. Suddenly I needed to be using the 3rd hashmark, or I was going to miss. The wind was always one step ahead of me.
So I gradually came to just use the target as my scale, judging from the wind whether I needed to put my center "+" "two dog-lengths" over or three, or whatever. I found that to be a much, much quicker system than trying to count hashmarks over and then be sure you are keeping the correct mark on the target while the wind forces you to change marks. It is also way easier to keep the center "+" where you want it than to keep some outlier in place.
Anyway, it is not as exact as using hashmarks, but it is workable where using hashmarks isn't, and it therefore works way better for me in the typical prairie wind that varies a lot. Yes, not all p-dogs are the same length, but you get to where you can judge their size pretty well, and that is close enough.
Here is my favorite dog rifle, a 204.
The reticle in the 5-25 ATACR looks like this:
Note that none my useage has anything to do with "FFP vs. SFP." I still prefer SFP so the reticle doesn't get thick at high mag, even though the only part of it I'm using is the center "+".