Whether this is your first pet, or you've had pets all your life, it is important to understand that each animal, large or small, has their own behavior and temperament. An animal's behavior is a product of both nature, its genetic composition, and interactions with its mother, other animals, and you. Despite best efforts with training, exercise, socialization, etc, there are still circumstances where additional behavioral resources are warranted.
Behavioral problems can be a detriment to the bond that you share with your animals; they are a primary reason for relinquishing animals, and can even be reasons that owners opt to put animals down. It is important to discuss the behavior of your animal with your veterinarian, so that efforts can be made to avoid any unfortunate circumstances due to behavioral issues.
The following are some of the issues where resources and medicine are available to help with your animals' behavior:
Anxiety and hyperactivity
Car travel
Fear due to thunderstorms
Unwanted urination habits
Unwanted coprophagia (eating feces)
Excess licking
Keep in mind that certain behaviors can be avoided by spaying and neutering your dogs and cats.