The personality of a dog is flexible and indeterminate. Dogs can be exuberant or shy; friendly or hostile; fearful or bold; aggressive or passive or some combination of the above. These differences in personality may to some extent be determined by breed, or individual genetics, but for the most part it is based on how and to what extent each particular dog has been socialized.
For the health and wellbeing of your dog, training should really not ever be considered an option when owning a dog. Well trained dogs are more likely to be behaved and listen, be void of behavioral issues, be good in public, and are less likely to bite. Owners also have a much closer connection with the dog when the time is taken to form a relationship through training.
Food, shelter, exercise and regular visits to the veterinarian are all a part of the basic care package that accompanies dog ownership. However, there is one more important aspect of proper canine care that must not be forgotten or neglected, and that is grooming. In order for a dog to stay clean and healthy, proper hygiene must be maintained, and given that dogs can do little more than lick themselves to remove the occasional annoying substance, grooming of your animal is your responsibility.