You can't just look at a horse and know that it has a significant parasite load.
You also need to KNOW what you are deworming with and the details about that specific product. Dewormings a month apart may do you absolutely no good depending on what two products you used in what order just because of how long they suppress egg shedding and what types and life-stages of worms they affect.
In WA, unless you didn't do a fall deworming with ivermectin or moxidectin there is no reason to deworm in Dec. At that time of the year the weather inhibits parasite reinfection rates.
How old is this horse? Do you have any idea of the names/types of products you used? How is she normally kept? Are paddocks/pastures picked regularly?
No, you can't. You need fecal egg counts and floats and whatnot, which, honestly, seem like a waste of time in my situation. BUT you can look at a horse and guess. There are lots of times that I've posted in critiques saying they looked wormy, and I wasn't the only one. I was just wondering if she looked wormy, because maybe someone is seeing something I'm not.
Yes, I should know what I used, but I don't, and threw away the carton. I usually do, but I've never had a worm-related problem so it's not at the top of my "must remember" list. Maybe it should, and I'll try to keep better track, but at this point, there is no reason to dwell on the fact that I don't remember.
I de-worm every three months. December, March, June, and September. The one in April was impromptu because of the tail rubbing. BUT, if I can skip December by using something in particular, I'll definitely look into. Saved money is saved money. =]
Gracie is 20 months. She is kept outside 24/7 and pastures are not picked at all. Hopefully this summer when it dries up, I'll get a tractor out and clean everything, at least that's the plan. But as of now, most everything is a big soupy mess. They do have specific bathroom spots though, and never graze anywhere near it.
As far as guesses, I really don't have any... Quest maybe? Pyrantel? No idea. I could just be thinking of those because of the posts I've read today. =|
EDIT: I just re-read what I wrote and I realize I might be coming across a little snippy, but that is not at all the intention. I don't want to take the time to re-write and make it sound less snippy, but rest assured, everything was said with the utmost respect and no eye rolling in sight! =D