Human: My dog is getting a little older, and I've been wondering if it's time to start thinking about getting him some dog food. Any suggestions? Assistant: 
It depends on what type of diet your dog has been eating in the past, as well as his current health condition. If he has been consuming commercial pet food before, you may want to consider switching to a natural or holistic diet instead. You could also consult with a veterinarian who specializes in nutrition for advice on which type of food would be best suited for your dog.