It is extremely hard to find a multi-vitamin for pets overall. Most of the better ones come from your greens powders. Most all brands I ran across contain some really horrible ingredients in them..such as Titanium Dioxide, Lecithin (soy or sunflower), soybean, yeast, Dicalcium Phosphate, vegetable oils, syrups, dextrose, maltodextrin, Magnesium Stearate and many more....
Companies really don't care what they put in it. Much like our human foods.
I also found where many are hiding their complete list or label of ingredients. Any company doing that, has something to hide and don't want to provide you with the truth.
Pay close attention to the INACTIVE ingredients. Chews will have more junk in them as well as tablets. Look for powders for your best supplements.
These I have found that don't contain JUNK ingredients and are safe for your dog.
Remember, being manufactured in the USA is not the same as SOURCED from the USA.
Click images to go to the product
Dr Mercola - B COMPLEX (not a multi-vitamin)
Microcrystalline Cellulose, Beef Liver Powder, Quinoa Seeds, Folic Acid Supplement, Niacin Supplement, Pantothenic Acid Supplement, Pyridoxine Supplement, Riboflavin Supplement, Thiamine Supplement, Biotin Supplement, Vitamin B12 Supplement.