Summer, our nearly 13 year old rescued blond, long tailed cocker spaniel is getting up there in age. She's been losing some weight, and doesn't always seem to like to eat what she's currently on. They've been buying Chicken Soup for the Dog Lover's Soul, Senior. Parents aren't doing extremely well financially, but will try to afford whatever it is she may do better on. Anyone have suggestions for goood food for senior dogs that may be reluctant to eat?