Telling a Horse's Age from its Teeth

The central incisors at fully grown and showing wear by 3 years. At 3.5 years milk teeth laterals on the upper and lower are replaced by permanent teeth.

4 Years

Lateral incisors now are fully grown and showing wear. 4.5 years the milk teeth in the corners of each jaw are replaced by permanent teeth.

4 to 5 Years

In male horses and sometimes in females small pointed teeth called tushes or "canines" appear behind the corners in the bars of the mouth.