My dogs and I LOVE the vanilla-mint enzymatic toothpaste by C.E.T, recommended by my veterinarian. I buy mine at my vet's office, but you can also get it on-line (I've never seen it in a pet store, though I've looked). I tried another brand that was beef flavored and they didn't really like it. They go crazy when I get the CET toothpaste out... they think it's a treat

and it makes their breath smell minty fresh.
Here's a link:
http://www.amazon.com/gp/product/B00...420436-7234313
Good Luck!