Same issues with my Lola....really bad breath. 19 months old the only difference here is that she just gave birth to four beautiful pups three weeks ago this coming Thursday. She pants a lot and I know open mouth breathing contributes greatly to bad breath. She normally eats dry kibble only but during the nursing period she is eating puppy kibble and puppy wet food along with eggs, cottage cheese, etc. Maybe it's all the new food. Any help would be appreciated.