I have a little dog and 3 medium size dogs. They are competitive and sometimes become too noisy and overzealous in their enthusiasm. What works for me is ignoring them when they're noisy. Specifically, if they want a treat and are noisy, I do not respond until they quiet down. Yelling at them just gets them more excited. The instant they're quiet, then I respond to whatever it is they want. The only exceptions to not responding to excessive barking is when they are asking to go outside or are warning me about something. The bottom line is, if you want to encourage the behavior then buy into it and bark along with them. If you want to discourage the behavior, then don't respond until they're doing what you want them to do. This is a very oversimplified answer, though. But with excessive barking, trying to talk them out of it can be interpreted by them as you joining in their barking fun.