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SOURCES OF BIOTIN, FROM A WEBSITE ON DIET FOR PREGNANT MOTHERS, SURELY APPLICABLE TO DOGS AS WELL:

Swiss Chard – This green plant is a top producer of biotin. It’s also a great part of a healthy salad choice that will provide antioxidants and help balance a diet.
Carrots – Carrots contain a supply of biotin, as well as beta-carotene, which helps with general eye health.
Almonds, Walnuts and Other Nuts – A variety of nuts supply the body with biotin, and are a portable way to get proteins and other nutrition into a diet.
Chicken Eggs – Eggs are a source of biotin, although it’s important to note that eating a diet unusually high in egg whites can actually be a catalyst for a biotin deficiency. That’s because a specific element in the egg whites binds to the element and prevents it from being distributed properly. It’s important to always consider how eggs are added to a diet in order to prevent this kind of vitamin deficiency.
Goat’s Milk and Cow’s Milk – In addition to calcium and other healthy items, milks are also a source of biotin for the body.
Berries and Fruits – Some types of berries, including strawberries and raspberries, can get the body a significant amount of biotin. These fruits also provide antioxidants and health benefits, as part of a natural, whole food approach to eating. Experts recommend buying local and organic when possible.
Halibut – In addition to being “brain food,” this fish also contains large amounts of biotin. Think about adding it as an occasional entre.
Vegetables – Other vegetables like onions, cucumbers and cauliflower all contain biotin, and are healthy ways to fit this vitamin into meals.