While this may seem like an obvious red flag, some dog owners are quick to assume the dog "got into something" or simply isn't feeling well. Diarrhea or constipation can actually be a strong indicator that the dog and diet aren't compatible.

Along the same lines, excessive or abnormal flatulence (in smell or in frequency) is a sign that something isn't right with the dog's diet.

Like human beings, our canine companions will gain and lose weight in life based on diet and exercise, so when an otherwise healthy dog is getting a normal amount of daily movement and is still gaining or losing weight disporportionately, it is safe to assume there is a problem with the current diet.

Dogs scratch, but when dogs scratch all the time, it can be a sign of a food allergy caused by the ingredients in your pet's food.

If your dog has a consistent ear troubles and you've tried everything under the sun, consider whether the current diet is to blame. Believe it or not, gunk building up in a pet's ears can signal allergies.

Ever notice how your dog seems a little slower after eating? Have you worried or commented that your dog is suddenly acting more sluggish than normal? It could be because your dog's current food isn't providing enough vitamins or nutrients to support them.

Speaking of low energy after eating, does your dog get sick after eating meals on a regular basis? Does your dog vomit whatever he or she recently ate? If so, that could be a sign that the current food is not sitting well in your dog's digestive system.

Again, just like human beings, our furry friends are deeply affected by what they eat. Consider how you feel after eating a meal filled with heavily fried or fatty foods, or think of what happens after a child has been given too much sugary candy. If your dog is responding to things differently after you switched its food, it is possible that food is the main culprit.

If your dog has never struggled to eat until you switched their food, a sudden change in appetite can signal a problem with what is being given.

The good news for all 9 of these signs are that a quick and simple change can make a world of a difference without expensive tests or troubling diagnoses.

Here at Raw Pet Food, we have been doing our part to make dogs and cats healthier since 1998. We carefully research the finest ingredients and products so that you can confidently give the best to your favorite furry friends, and we ship the food directly to your doorstep so you never need to go to the pet store. See the difference raw pet food can make; affordable, convenient, and direct to your door. Your pet will thank you!