Congratulations on your new pup! He is adorable! I think he looks all Yorkie.
Thank you for taking him in!
I feed Orijen Adult kibble to my three-year-old and he does very well on it. It is neither Yorkie-specific or even small breed-specific, but I love the parent company (Champion Pet Foods) and their philosophy on a dog's ideal diet. I will occasionally add about a tablespoon of wet food (I use Wellness Core) if he is acting picky about eating kibble. As far as Canidae, I have never personally used it, but it is MUCH better than Eukanuba.
Levi gets a bath about once a week (more often if he rolls in something stinky outside) and I usually use Nootie shampoo and detangling spray. It smells awesome! He gets professionally groomed every couple of months, and I trim up any stray hairs between grooms. I am trying so hard to let his hair grow a little longer!