My Yorkshire Terrier is 8 years old and she has teeth that are really going bad. I've tried to keep up with brushing them, but I haven't been able to stave off bad breath and brown teeth. I don't have the money for the vet to put her to sleep while she cleans a tiny mouthful of teeth so when a friend told me that she had the same problem, I perked up. She said that she researched and found out that feeding a spoonful of plain yogurt twice a day to your pet will help its digestive system AND bad breath and tooth decay.
I've been giving Bobbi a spoonful in the morning and one at night and after a weeks time, I'm beginning to notice a difference in her energy level. Her bad breath is not nearly as offensive either. By the way, when she sees me get out her little yogurt container, she comes running to get a spoon of it.