A lot of shelters do the best with what they have. It's sad but usually local shelters have no choice but to put animals down. With people breeding unecessary or accidental litters there are just too many animals without homes. Shelters do their best to care for them, but at some point they just run out of room. Local animal controls have to take in the animals that are brought into them, if they are reiceving 50 animals a day and are only adopting out 20 where are they going to keep all the extra animals? Do you want them to sick 10 dogs to a kennel? It isn't the shelters fault, it's the fault of people who don't care to spay and neuter their pets and don't care what happens to the cute puppies that they produce just because they wanted their child to see the miracle of birth or whatever silly reason they chose to breed.

I also wanted to add that I'm not refering to responible breeders because they actually take responsibilty for every puppy that they produce.