Yippee, Yappee and Yahooey

Yippee, Yappee and Yahooey was a Hanna-Barbera cartoon which premiered September 16, 1964. The show was presented as a segment of Peter Potamus and his Magic Flying Balloon, along with Breezly and Sneezly and Peter Potamus.

Yippee, Yappee and Yahooey are dogs who serve the King as his royal guards. They must always protect, serve and obey the King. At times, the three heroes find themselves fighting a fire-breathing dragon and other villains. A common mistake in nearly every short is that Yippee, Yappee and Yahooey's voices tend to get mixed up with one another.
From: Wikipedia.org

Yippee, Yappee & Yahooey - Black Bart