Are you giving any supplements daily? Do you give Salmon oil or other source of extra Omega 3-6-9? What detergent do you use? Do you use any carpet freshener or scented/burning candles? What do you wash your floors with? Dogs can be allergic/sensitive to detergents, perfumes and other items designed to mask odors so you have to consider what their skin/fur comes in contact with an possibly the problem is there. What shampoo are you using and how often do you bathe them? And too, this time of year many dogs will be shedding some of their heavy winter coat so are you certain that they are losing alot of fur, or is it just 'normal'? Is the skin red or flaky in the areas of greater fur loss? DID YOUR VET GO OVER THESE QUESTIONS WITH YOU???