I'd say the top 5 reasons we get for why dogs are surrendered to us are:
1. The animal needs medical attention that the owner can't afford.
2. The human is ill and can no longer care for the dog.
3. The human wanted a puppy and forgot how much work a puppy was.
4. The human has lost his job and can't afford to keep the animal.
5. The human works/travels too much and doesn't feel it is fair to the animal to be alone/boarded so much.
Of course, a lot of what humans tell us about their reasons turns out to be total bullshit, too. The dogs never bullshit us.
1. The animal needs medical attention that the owner can't afford.
2. The human is ill and can no longer care for the dog.
3. The human wanted a puppy and forgot how much work a puppy was.
4. The human has lost his job and can't afford to keep the animal.
5. The human works/travels too much and doesn't feel it is fair to the animal to be alone/boarded so much.
Of course, a lot of what humans tell us about their reasons turns out to be total bullshit, too. The dogs never bullshit us.