I am sooooo picky about dog supplements, ESPECIALLY multivitamins. They're usually filled with junk your dog doesn't need, and vitamins your dog has no access to because they aren't bioavailable. I have no complaints about Canine Complete - it's the first multivitamin ever that I can actually recommend!
It has lots of whole foods in it (organic kale, organic pumpkin, etc.), and some quality vitamin sources as well. However, what I absolutely love the most about this product is its quality as a probiotic - it has two different types of probiotic in it (lactic acid & spore forming), AND it has several different strains of each type. Plus, it also contains digestive enzymes. Both me and my pup love this stuff, and it's great for gut health.
Just a side note, because of its potency as a probiotic, you will want to start off gradually!