Can the PlexiDor hurt my pet’s tail? No, the pet’s tail won’t get hurt. Theoretically, a cat or dog with a long tail could go outside and hesitate long enough for the tip of the tail to still be in the door when the panels close, but they close so gently that the tail won’t be damaged. If this were to happen, most cats and dogs would look back and wonder what’s touching their tail. Worst case scenario, the pet would be startled.