To my understanding its just a place to start, not a rule.
From what I've learned & seen with many dogs, is when you feed the higher end kibbles, you can switch brands all you want & mix n match for variety, as they have no bad chemicals or doo doo in them, so there isn't any reason for the dogs to become ill. If I'm correct, its the chemical changes in the lower quality of kibbles that cause food change issues.
Before Digi's allergies became severe she was on 2 brands at a time & I use several brands with different fish/chicken flavours. That never made her ill, not even with her sensitive gutt... Well now it'll kill her as her allergies are severe... so I'm not sure if using her as an example is even good... But I've talked to many people at that store & they mixed things up all the time too, just like I did & non of their dogs became ill. So I really do think its all those chemicals that are hard on the gut when it comes to changes.
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