At their age, they might need a dental. I have worked for a Veterinarian for over 27 years and cats usually have a dental twice in their lifetime. Please have their teeth checked, I have 3 cats and a Welsh Corgi. Each of my cats have had a dental in the past year and my Corgi (age 14 1/2) has had 2 in his lifetime. Dental disease in cats/dogs can cause other medical conditions.Please see your Veterinarian. Good luck.
Try adding warm water or milk to the dry food. I have an old cat abt:16yrs. she will eat dry food that is moistened with milk or water.
Given their ages, they may have dental problems that cause them discomfort when chewing hard, dry food. Consider switching to a softer food, and see a vet.
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