I buy my Kefir from either Costco or the grocery store, they sell an organic brand, it's called something? Meadows, I can't remember the exact name brand, but it's $5.99 for a small jug. I don't know if I'd be as ambitious as to make my own. My mom used to make her own yogurt when we were kids, she made it plain, and we added fruit, or granola and honey to it, it was very delicious.
LEARN A LESSON FROM YOUR DOG, NO MATTER WHAT LIFE BRINGS YOU, KICK SOME GRASS OVER THAT AND MOVE ON.