Anything is easily punctured when there is a cat around :-)
One of our fur-balls was very docile, except when it came to putting him in the cat-carrier.
He always managed a protest poo, during the carrying to the car, then after cleaning carrier, he'd poo in that en route.
Clean it at the vets - another protest poo on the way back.
Who-ever thought that one cat could contain so much ?!!