It has been my experience that most horses who get scratches (especially the ones that advance to cellulitis) have an underlying health issue going on. Examples:
- A horse who developed scratches at the drop of a hat for years and years, despite diligent management. In his late teens, the horse was diagnosed with PPID. After starting treatment with Prascend, the horse never had another case of scratches (or rain rot, which had also been an issue for most winters of his life) again.
- I had a filly get very sick last spring with an unidentified GI illness of some sort. Two weeks later, she developed a nasty case of scratches on all four legs.
So, I’d suggest doing some digging into the horse’s general health and immune function to try to reduce his susceptibility.
As far as treating acute cases, these tips have consistently worked for me:
- Clip the affected legs. Long hair traps moisture, and moisture exaccerbates scratches.
- Wash daily - and dry thoroughly afterwards - with an antimicrobial shampoo. I like MicroTek, but dilute clorhexidine may be a better option for severe cases.
- Apply ointment daily after washing/drying. I mix equal parts silver sulfadiazene, triple antibiotic ointment, and hydrocortisone cream.
Evaluating the diet is of course part of supporting healthy immune function. Be aware, though, that there is no evidence to support the popular online “more copper and zinc to ‘balance’ iron” practice. All metal ions (copper, zinc, iron, manganese, sulfur, etc.) are absorbed via the same transporters in the intestinal lining. Once all the transport sites are saturated, adding more of any nutrient doesn’t increase absorption, because there is no mechanism by which that can happen. Instead, I advise customers who are concerned about nutritional antagonists to ensure that the feed or supplement they are feeding contains sufficient copper, zinc, and manganese in the form of amino acid chelates, which are absorbed by an entirely different pathway and therefore bypass potential interference from antagonists.