If you already have a pet and plan to add another, matching personality types may help make the transition smoother and the outcome more successful. A shy, quiet pet may not appreciate a wild, rambunctious home invader. Older pets may find it easier to accept a very young pup or kitten.

Begin by isolating the new pet to one room for a couple of weeks. Try feeding the resident pet and new pet on either side of a doorway. When the existing pet eats, allow the new pet more freedom. Be sure the senior pet can get away from the youngster when desired.

Praise and give treats for all friendly, calm, accepting behaviors. Associate the new pet with all good things. Bribery and flattery will get you everywhere!

Animal behavior experts Susan and Roland Tripp are the authors of "On Good Behavior." For more information, visit their Web site at AnimalBehavior.net.