Normally, the roots of the baby teeth are reabsorbed as the adult teeth take their place. When this fails to happen, you will see what appears to be a dou- ble set of teeth. Toy breeds, in particular, tend to retain baby teeth as their adult teeth erupt. The adult teeth are then pushed out of line, producing a malocclusion or bad bite.
Treatment: Puppies 3 to 4 months of age should be checked from time to time to see that their adult teeth are coming in normally. Whenever baby teeth interfere with adult teeth, the baby teeth should be pulled. If this is done by 4 to 5 months of age, the bite should correct spontaneously.