Why are so many turned into shelters?

I am fostering a Jack with Lost Angels Animal Rescue out of Tampa, He is a great dog. He is so funny and smart. He loves to play, and gives kisses. What I love the most is when I come home I can see him "Jumping" for joy that I am there. hehehe.... How could someone just toss away such a great dog....

We accidentally got our JRT "Boomer" when he followed me and our other dog on a walk. We tried to adopt him out as a foster and I was amazed at how many people who have little condos or apartment dwellers thought he'd fit in with them at their place. They think because he's smaller he's a little lap dog who doesn't need exercise. After a few rough meetings (even people who had JRT's didn't understand it seemed) he's with us now and fell right in line with the other terrier and Sheperd mix. My buddy actually devised a rig to run his boxers on his bike and has put Boomer on there a few times. He loves it! That's the way for Boomer to go.....