Hi dillon
Sorry this post is a little late, I have a diabetic dog, he was diagnosed 2 years ago now, and also has an insulin injection twice daily and he's still very healthy indeed aged 11, my vet advised me that I should keep the injections and meals as close as possible to every 12 hours, a few minutes or even half an hour won't cause too much of a problem, but if you delay too much you are putting your pet at risk I have always stuck to this regime, and all has been well thankfully, therefore I think that if you're going to need to be late by more than half an hour or so you do need to get some back up, hope this helps