Hmm, I wonder if we should do this? We actually feed the dogs on Burns so would there be any harm in adding a little of the RC. The advisor I spoke to seemed concerned on the vitamin deficiency rather than the food being rancid.
If you mixed it with enough of the Burns so that it was far out weighed by the Burns then I would but only if you can mix it with plenty of Burns so that it hardly makes a difference in each meal yet gets used up over time.