"Oh, dear, oh, dear, something is not right!" The collie's calling card. ^.^

If Sam (an old rehomed collie my mother kept the last couple years of his life) and Foxie (her rescue foxhound) had been with her at the same time, I imagine many scenes such as you describe.

By all means, keep rewarding Bliss for tattling on the hound. It'll keep Zhava (somewhat) honest!