Yes, you are right. They all have a special treat. We use this treat thing to keep competition down amongst the females! (who tend to be hissy at times).

Sheba gets shrimp! She will also eat raw chicken.

Tippy gets turkey or chicken left overs, and some lunch meats she likes too, and tuna or salmon of course, and the skin off chicken or turkey is her fave, but I don't always have that left over.

Oreo is dairy all the way. Cheese, ice cream, milk (when she was a kitten) and the whipped cream now is the fave. We suspect she was given this by the children in the home she lived when little. She was desperate for my milk left overs from cereal, and she actually put her paw on a piece of pumpkin pie with whipped cream one Thankgiving and pulled it over to herself--- just like in a cartoon! So I ended up using this as her treat. We have never before given cats dairy either!
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Each day they get a little bit of their fave. And it has worked wonders for us in many ways!