UCNA (under chin neck area) is used to describe a very under-recognized, under-appreciated feature of a dog, and sometimes a cat, bunny, squirrel, mouse, and goat.
The term, "UCNA" is used with humor, and might be commonly thrown around behind the scenes in the veterinary medical field.
"damn, look at the UCNA on that bulldog!"
"On scale of 1-10, your goat's UCNA is a #8 on the chart of strong UCNA's.
A tactical chest harness designed for both dogs and cats. Once fastened, your pet then becomes a Victoria Secret model
by repping the look of women's panties secured around their "bushy" chest area.
"Damn, look at that free-range bush in those chest panties."
"I like the fit of your cat's chest panties. Where did you get those?"