Excel Brewer's Yeast mega-tabs with Garlic and Omega 3 fatty acids. When given to your pet dog or cat on a regular basis, these pills help them maintain healthy skin and sleek, shiny coats of fur. You won't notice results immediately, but after a few weeks of taking them daily I've seen significant improvement in both my dogs skin and hair. I've also heard that Brewer's Yeast pills help prevent fleas, but I don't know how accurate that is.
The actual tablets can be seen here.