tank in fiction: flash, one word, etc.

Tank was a cat. A very big cat, owned by my sister and fed by her in the fashion that our mother fed us. Basically anything we wanted, without regard to the girth of our bellies. For most of us, it was unhealthy and we pay the price as adults, whether it be through disease or the extra charge for Extra Large. Tank got caught laying in a driveway, resting his tired bones. Invisible to the car that ran over him.