I am looking to get a dog for my family. I have 3 kids (9,6 & 1). My wife was never a dog owner, I was. I am looking for a short hair dog that is medium size. I also want the dog to be easily trained. I will probably get a mutt. But, was curious as to what breeds I should look at. I don't want any little dogs. I was looking at beagles. But, my brother heard they are whiny. Any suggestions would be helpful. Thanks!