Thanks, Bill.
We do worm quarterly, yet we just acquired another horse (dear God), and are worried that it hasn't been wormed in a very long while or in a timely manner.
We wormed him with Ivermectin and wonder if we should reworm him sooner and if it would harm him if we did. I noticed today that there was bot larvae in his poop.
I guess, the bottom line is...maybe we should ask the vet...but when we took him in for vaccinations nothing was said about it and taking him back in...oy vey.
I've probably answered my own question.
Alice