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I might be wrong but my understanding is that the frequency hearing range in dogs is what is greater than humans not their sensitivity to sound. This just means that dogs have the ability to hear more frequencies than humans not that their ears are necessarily more sensitive. I would assume that dogs have a different peak range of hearing than humans but I have no evidence to base this assumption on. Either way, I would not fear for your dogs hearing unless he/she gives you reason to suspect a deficiency or if your dog runs away from a sound as if it bothered him/her.
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