Do your pets a favor and research what goes into a high percentage of dog foods. Do you know what digestive contents are? It's whatever happens to be in the gut of slaughtered livestock. Livestock that is not healthy enough for humans to eat, is bought by some of the pet food companies. Have you ever though of what happens to large animal roadkill? Some companies collect bodies of cats and dogs from pounds. That sounds like a lie, but that's what research coughed up. My sister and I were both researching, and discovered the same information. Many years ago I had purchased a cheaper dry dog food, and found a piece of a red nylon collar in the bag. How do you suppose that got in there? Oh, and creosote is often used as a preservative on the meats used in pet food.
My 4-legged children are fed a good quality dry food, to which I add canned people veggies. Green beans, peas, beats, carrots. Now all of them at once. LOL In addition I'll add a little of whatever kind of meat is on the dinner table. Lolly, my female Chihuahua loves raw carrot sticks.
Something you may consider is a gelatin supplement. I get it from the vitamin aisle. When Lolly turned 9, she began getting stiff joints. It took awhile for me to come up with the idea of giving her the supplement. After just a week of getting the gelatin sprinkled onto her food, she was getting better. It has been about 3 months now, and she is no longer stiff in her joints. She can run again.