Perhaps you're right : he would try always to eat horse poop, or worms, or slugs during walks... So maybe kibbles open past one month isn't that big of a deal
I was a bit afraid in the sense that he never had a problem with his kibble before
But also heard that the kibbles refusal is a thing. As you said, eating the same thing over and over again each meal can be not very enticing at some point
Dont want to waste food, but not at the expanse of my buddy's health