One trainer I really admire and respect is Ken Ramirez. He's been a professional trainer for several decades and has trained hundreds of animals and many different species. This is a quote from a lecture he gave and its available on http://www.youtube.com "Barkin at the Shedd" "To often people look at training as if it were a luxury they train if they have time and that is the reason eight million pets are put to sleep every year because people bring pets into their homes not thinking training is an important part of their care." So then when the dog messes up their carpet or barks and keeps the neighbors up, they end up taking it to the shelter where it often gets put to sleep. Because they didn't think training was important. They knew they had to feed it. They knew they had to take it to the vet. But they didn't think that training was important. That's a shame. Because training provides such a high quality of life to the animals that we care for."