I use yoghurt (full-fat) as ice cream treats, I just half-fill some paper cups with the yoghurt, add a little (organic) honey and let it freeze in the freezer. At hot evenings, she can enjoy her doggy-icecream.
And (organic) yoghurt is helpful to dogs with bouts of diarreah, as it contains probiotics.
I actually just feed two acidophilus tablets every night: 2 billion parts per capsule. Some nights, I feed them in a blob of cream cheese. On the nights that I'm feeding a mixture of MM, I open the capsules and just dump the powder in and stir.
So,I'm not exactly feeding yogurt. But he gets the same benefits. Plus, it saves room in my refridge. My dogs' food takes up a TON of room in the refrigerator; this is one place I can wrestle back a bit of space for human food -- like the carton of milk!
I started Grimm on yogurt for a month before we began raw, in preparation for happy gut flora. Just a heaping tablespoon 1 or 2 times daily of lowfat plain. Each week when I buy a container, I tell Grimm "It's your Bucket-0-Bugs!!"