Suggested serving sizes are notoriously known for being too high. And in reality are only starting point. Another way estimate a starting point that is generally more accurate for raw food is 2.5% of body weight per day. But every cat is different...if yours are maintaining their weight and are healthy then they're eating the right amount.
Gizzards really don't have anything in them to help scrape tartar off teeth. They are chewy and will help jaw strength. For dental health it is better to use chicken wing tips or necks. Both contain bone that will scrape teeth. Do not blanch or cook in any way, as cooked bones can splinter.
Instinct raw is heavier in ground bones, which can cause constipation, than other brands. Then if you add wings or necks for teeth you'll be making the situation even worse for your one cat. You'll need to manage that carefully. Another alternative would be to switch to another brand of food...Primal does rabbit.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...