Cavalier King Charles Spaniel Puppies have 28 primary (baby) teeth that begin to erupt around 4 weeks of age. Between 4 and 5 months of age a Cavalier King Charles Spaniel puppy will get his permanent teeth pushing out the baby teeth. If baby teeth have trouble falling out you will need to see your veterinarian as retention can lead to misalignment. A Cavalier King Charles Spaniel's bite can take up to two years to settle into permanent position. A scissor bite at 8 weeks will usually remain a scissor bite in adulthood. An undershot bite will often correct itself, but an overshot bite will never correct itself. A scissor bite is most preferred, but a level bite in Cavalier King Charles Spaniel's is acceptable in the conformation show ring when being judged.

An under bite occurs when the lower teeth protrude in front of the upper jaw teeth.

An over bite (parrot mouth) occurs when the lower jaw is shorter than the upper. An over bite is never considered normal in any breed and is a genetic fault.

I have witnessed a puppy having a scissor bite at 8 weeks and then around 6 months of age and slight under bite develops, but then around 12 months of age the bite returns to a scissor bite. As puppies develop they go through structural changes that can throw the bite off temporarily.