Some dogs are just simply more vocal than others. Don't underestimate your dog's size and the size of its bark. A barking dog, even a small one with a shrill bark, can upset neighbors, and you. The constantly barking dog has already reached a saturation point, and tells us nothing, other than that it needed help a long time ago.
Crate training does help barking training too.
Stop the dog before it escalates and is so excited it cannot hear anything. Divert the attention with a trip outside for potty, praise, and then play and then praise. Once again, understand your dog's heritage, and why some bark more than others. It is a warning signal. Either the dog has been left alone to long, in its crate to long, or it has to go out.