A distraught dog owner called his vet pleading for an immediate appointment.  He explained that his dog had a large growth or swelling near the corner of its mouth. The vet told him to bring the animal right over.

When the man came in, the vet examined the dog as the man stood by, anxiously waiting.  At last the vet turned to him and asked, "Do you have any children?"

"Oh, good grief, is it contagious?" the man gasped.

"No," the doctor answered. "It's bubble gum."