It's natural canine behavior to chew on all sorts of things, roll in other animals' droppings, hump and fight other dogs, menace anything that invades the home. All these behaviors can be curbed, but that takes a lot of work. Trainers say it requires nearly 2,000 repetitions of a behavior for a dog to completely absorb it.
A good breeder or experienced rescue agency wants you to prove that you'll be a capable caretaker. The interrogation and screening can be annoying, but it's also a sign that you're on the right track. A breeder ought to know if you work long hours away from home, have a fenced yard, have kids or other animals, or if you have access to parks.
It's important to remember that the animals are not grieving with us. They're very accepting. They're not lying there thinking 'How could you do this to me? Why aren't you keeping me going?' Pets don't do the human things of guilt and anger and recrimination that we do. They come and go with great acceptance.
Bites are usually not random attacks by strays. The great majority of biting dogs belong to a family member or friend of the victim. When a young child is the victim, the attack almost always occurs in the family home, and the perpetrator is usually a 'good' dog that had not previously behaved in a menacing way.
Animals have come to mean so much in our lives. We live in a fragmented and disconnected culture. Politics are ugly, religion is struggling, technology is stressful, and the economy is unfortunate. What's one thing that we have in our lives that we can depend on? A dog or a cat loving us unconditionally, every day, very faithfully.