Lately Ive noticed that my two year old chihuahua would rather eat the cats food than her own. I buy "Pedigree Little Bites" for my dog and Purina "Indoor Delights" for my cat. However, whenever I feed them, my dog heads straight for the cats bowl, and will eat her food only when the cat kicks her out of her food (which happens after a few minutes). Is it harmful if she eats some cat food?