Dogs needing head protection need look no further...
Well, while we're dealing with stupid pet products, let's have a look at another. This description from the website will allay any concerns you have.
"Does your dog have stand-up ears? Not to worry.....'The Helmet' was designed so that it does not rest flat on the head. The customizable foam pads that are included fit between the ears, not over them. This prevents 'The Helmet' from pushing the ears flat to the head. The dual adjustable chin strap lets you custom fit 'The Helmet' for almost any pet dog, cat or guinea pig."
I really wish they had a picture of the guinea pig with one of these things on...