Yes, my NF mare had it 2 summers running. The 1st time I had to stop the doxy as it was upsetting her stomach badly. The drug changed to powder the following year and I also fed a gut supplement.
Her only real symptom was lethargy. She did present a little footy on stony surface but 2 vets and...
I could do with moving mine back into the other field due to the rain making their current one rather muddy, but it has a carpet of the damn things. I'll be investing in yet more electric fencing (for the wretched deer to take down and spread across the field on a daily basis😠).