I kind of agree with the person that told you not to do that. Your dog is eating, your dog is fine. The dog is not having trouble with the fireworks, so just ignore it. Praising the dog for not having trouble with the fireworks is kind of like suggesting the dog should take notice of them.
And while it should not create fear of fireworks, it could make your dog anticipate treats, and become anxious, insistent, you hear the big booms, where's the liver???
I think that sometimes we anticipate issues that we have heard of, and we either set the dog up to see if they have that issue, or we go right to working to avoid/remedy the issue, that we can actually increase some less than desirable habits. People are too dependent on treats. Dogs should not think that every time they run into something new or different someone is going to shove something yummy at them.
If you do that, when you get your dog into training, when you are trying to lure a dog to learn something new, the treats you are working with have less effect, because they are over used. I think the reason the best trainers have the total focus of their dogs is that they use praise and treats and toys effectively and efficiently in training.
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