I was going to suggest Petzlife as well! Zoe's breath is much more pleasent with them. Mints don't really work for her.
We sell Petzlife at our store
www.sassypup.net for an awesome discount for the individual gel and a great package deal. Besides helping with breath, it will prevent tartar buildup and staining. Try the combo of spray in the am and gel in the evening. I guarantee you will love this product! If you put in an order, you will get it within 2-3 business days! We also include a brochure with really clear instructions on how to use this product and alternative ways to use the item if they don't like brushing.
Jennie