Peta has some dog foods that they approve of, some are just mixes that you can use as a base and add some cooked organic protein/meat/fish of your choice.
You could use a vegan kibble or canned food as a base. My dogs are doing well on Zignature whitefish. I started using fish based kibble as a base over 5 years ago, no problems.
Half a carrot for a chew snack once a day, 2 meals with a splash of water added, long walks as tolerated…..
Oh, I hope you are brushing their teeth every day, small breeds tend to have lousy teeth (no matter what you feed) as they get older periodontal disease can strike. One or two professional cleanings/extractions per year tend to be the norm (in my experience).
Hope this helps
https://www.peta.org/living/companion-animals/companion-animal-food-guide/
PS: The Clean Label Project is bogus.
