“I’m incredulous at how much stuff is coming out all the time on animal emotions and the general rubric of animal cognition. We’re rewriting our stereotypes about animals with good scientific data,” says Marc Bekoff, a professor of evolutionary biology at the University of Colorado, Boulder. “What’s really exciting about all of this [data] is that it has huge implications for how we interact with, and treat, other animals.”
Marc Bekoff is quoted in this interesting article which basically confirms what we've known all along - that animals are as bright as we think they are. That they DO experience "human-type" emotions and that our pet's health is influenced by the nature of their environment.
It seems quite obvious to me, but now it must be fact - 'cause science says so!