Hi! Are these dogs intact? Also Border collies are high energy dogs that require jobs. They are very intelligent if you don't provide useful activity they will find there own activities. Also dashunds, mixes you say..These are hounds that go to ground hunt badger. If you are not careful the longer they are able to chase fowl there prey drive will kick in and they will be killing your birds. Also 3 young dogs with no real supervision/packleader will become a pack. A real nuicence to you and you neighbors. I have worked and trained dogs most of my life primarelary working herding breeds. I recommend neuter/spay,seperate and crate train and get help from a reliable dog trainer near you.