Thrush is an infection from the frog. In some environments or when the body is weakened, anaerobic bacteria will take the opportunity to feast on your horse’s soft tissues.
WHAT’S THE PROBLEM?
As you see in the pictures, the frog, being eaten away, looses its volume. However, keep in mind that if frogs exist on horses’ feet, there’s a reason.
If because of the infection, the frogs cannot function correctly, be sure that there will be repercussions somewhere else on the horse (navicular issues, lameness, unnatural locomotion, etc.). And of course, also never forget horses WALK on it. Imagine the pain that can result from that.
Look at that split between the heel bulbs. Now imagine gravels in your buttcrack (sorry for the comparison): Painful, isn’t it?
As a reminder, this is a healthier frog, although not 100% thrush free. Notice the tiny hole on the bottom right: it’s hiding thrush. This frog has never been “cleaned” with a knife to get there. Treatment, nutrition and stimulation have been our only allies.