I have a Nigerian Dwarf, probably about 4 years old. His hooves grow unusually fast, and I have already trimmed them for the 3rd time this spring. Instead of the dark sole under the hoof I trimmed off, I am seeing the softer white type of material that should be only on his heel. I trimmed at it some with the shears, but don't see the sole. I don't see any sign of foot rot; between his "toes", or hoof-halves, is pink and healthy looking. But his heels blend right into the bottom of his feet, with that sort of "gumdrop-like" hard heel material. Should I call the vet?