As a veterinarian with short fingernails, I don't understand how someone with long nails can reliably palpate a pet's abdomen to detect an enlarged organ, mass, or hernia, or identify swollen lymph nodes or enlarged thyroid glands.
In surgery, long fingernails can puncture surgical gloves, contaminating the sterile surgical site.
Many studies prove that long nails harbor more bacteria, viruses, and yeast than short nails, even after hand scrubbing. When I see long fingernails on a health care provider, what concerns me most is the increased risk of spreading infection.
Moreover, research shows that human operating room nurses have more bacteria on their hands after completing their surgical hand scrubs if their nail polish is chipped or if the polish has been in place longer than four days.
Multiple studies also demonstrate that artificial nails are more likely to harbor bacteria, viruses, and yeast than natural nails.
Of the many fingernail studies I read while researching your question, my favorite was the study of people with natural or artificial nails of various lengths whose hands were intentionally contaminated with either E. coli bacteria in raw ground beef or feline calicivirus in artificial feces. The volunteers washed with tap water, regular liquid soap, antibacterial liquid soap, alcohol-based hand sanitizer gel, regular liquid soap followed by alcohol gel, or regular liquid soap and a nailbrush.
Handwashing with liquid soap and a nailbrush turned out to be most effective at reducing bacterial and viral counts. This study also confirmed that people with long or artificial nails retained more bacteria and virus on their hands after washing than people with short or natural nails.
Even when whiskers are cut off—by a youngster playing with scissors or a veterinarian treating a bite wound abscess on the cat's face—the cat manages well without them, and the whiskers grow back.
Whiskers are specialized tactile hairs that help cats feel their way in dim light. Whiskers also detect air movement close to the face, which may warn of a nearby animal.
All carnivores and most other mammals sport whiskers, though they are best developed in nocturnal species such as cats.
Feline whiskers are so sensitive that many cats prefer to eat and drink from large-diameter bowls filled to the brim so their whiskers don't come in contact with the side of the bowl.