Hi Jay,

I hope your dog is feeling better now! Generally, it is not a concern if a dog gets into cat food or vice-versa. However, there are several situations in which you might run into problems. First, if you feed the wrong diet for long periods of time (months to years), then your pet could theoretically become deficient in important species-specific nutrients. For example, cats need to have taurine in their diet for healthy heart function, and canine diets may not have sufficient quantities of this amino acid.

Second, if the pet has a medical condition or allergy, eating the wrong food could cause a serious problem. For example, if a dog was extremely allergic to beef and ate even a small amount of cat food containing beef, he might end up with an allergic flare-up. Finally, there are diets designed for specific medical problems that if fed to the wrong pet, could provide inadequate nutrition or illness.  When in doubt, always consult with your veterinarian about your pet’s individual nutritional needs.

I hope this helps!

Dr. Kim Hester