An occasional nibble from the wrong bowl won’t do any harm for most pets—other than possibly an upset tummy.
However, there are good reasons to avoid feeding your dog’s food to your cat (and vice versa) over the long run.
Here are just a couple examples of how dog and cat foods are specialized to each species’ unique nutritional needs…
Also, dogs who eat cat food could put on excess weight, get stomach upset, or develop pancreatitis (inflammation of the pancreas that can be very serious and often requires hospitalization).
Again, for most healthy dogs and cats, there’s no need to worry if there was an accidental food mix-up.
Just make sure your pets receive the right recipe for their needs over the long-term.