Mutt muffs suck, they do nothing to deaden the noise.
4paws aviation are far better designed but their straps really suck, they're far to narrow and, by the time you get them on tight enough to seal, the dog is being choked.
If you're going to use muffs, then I'd recommend 4paws with a customized strap.
Edit: Buddy (below) had over 400 hours when he passed last December. Probably about 50/50 muffs on/of and, just like EdFred's Kaiser, he could still hear his treat bag being opened from the other side of the house!
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