I find it interesting that your vandas love it. Mine don't seem to care for it. The roots get discolored and seem to shrivel when I use it, and I use it sparingly. It probably has something to do with the different culture...since I have mine in vases, the fish fert is probably absorbed at a different rate (or some other equally complicated explanation...)
It's nice that you don't need to deal with the smell too much either... one time I accidentally forgot to dump out a vanda's vase and left it soaking overnight in water that had the fish stuff in it. The next morning I actually had cloudy water and a ring of slime around the top of the vase!! Oh, and my house smelled like a fishing boat on a hot day...
Oh, and as for your dog's, um...fondness for the smell... have you checked to make sure your Zoey isn't growing any new random root tips? You know...from huffing too much seaweed? You don't want to end up with a mutant dog, I imagine...