
Hi,
Are you thinking of the DAP diffuser? It's a plug-in that reportedly gives off pheromones similar to those of a nursing bitch, to make a dog feel relaxed. My mother got one for her dog who makes himself quite ill with agitation over fireworks, and whether it was that, or the fireworks CD she used as well, or both, it's worked! This year he just raised his head at the loudest bangs and muttered a bit, but wasn't barking and huffing and puffing for hours like before. Marvellous!
:)