I've had my rescue cats for 12 years. I'm guessing they're about 14-15 years old. They don't go out now (unless it's sunny and that's only for a minute or two!). I give them Felix Taste as Good as it Looks and IAMS adult biscuits plus water but I'm wondering whether to switch to a better dry food and do away with the wet food completely? I hate all the waste from the pouches and I wonder if dry food is actually better for them now that they're indoor cats? TIA!