Sorry but breeding mutts=irresponsible.
35 million dogs die every year in shelters.
And Im glad you find them good homes... Do you have contracts stating you will take the dogs back should the owners ever need to get rid of them?
Did you health test your dogs to ensure you are not passing on genetic diseases? (hip and elbow testing, eyes and ears? whatever else is relevant to your breeds of dogs?)
Did you title your dogs to prove that they are of breeding quality? That they possess more traits then being a nice dog that can be passed down to the pups ?
Sorry. But when millions of dogs die every year in shelters, I cannot sit back and let people who breed irresponsibly think they are not doing something wrong.