Ah. That's probably your issue.
Dog food makes rats stink. I would try getting a rodent block diet like Mazuri 6f or Native Earth(Harlan Teklad).
Also, I suggest cutting out the rabbit food. The rats don't benefit from it nutritionally.
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Okay, I just threw some rabbit food in with the rats off and on when I had them last for some variety. But if I start again I will just avoid that. I will also look into mazuri.