This is nearly identical to some seat protectors I had before. I have a bigger dog (105 lbs) and he has a tendency to stand up while I'm driving. When I hit the brakes suddenly, his body weight shifts forward. When this happens, he braces himself by shifting his weight to his paws and leans back. When he does this he puts a LOT of stress on the seams and they usually tear under the stress. This is why my wife adds two 4" strips of material, one above and one below the seams, then sews them together like a compressed sandwich of material! Anyway, the addition of this material prevents my dog's shifting weight to rip the joint at the seam.
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