Instead, speak to your dog in a soft but cheerful voice as you walk into the house. (aspca.org)
I do a lot of intervening by walking between them, talking in a very cheerful voice about «what good dogs we are — we all get along, and we are friends». (patriciamcconnell.com)
It wasn't until Weinstein heard the man's cheerful voice shouting «Take my picture too!» (visualnews.com)