Anal Glands / Damaged Undertail:
So one day you lift up a dog's tail, and there's 'actual injury' under the tail, often self-inflicted from some disorder under the tail. "They chewed or scooted their as_ off."
Here's how you deal with anal gland / scooting anus damage:
1) NO ACCESS to chew or lick, and if that's a cone or 'hotpants' diaper - okay.
2) NO SCOOTING, and if they're scooting, (it's hard to stop 'em) but put 'em on LINOLEUM or other slick surface so that abrasion is at LEAST minimal.
3) Anti-inflammatories [x]
4) Correction of the CAUSE of the scooting/licking like, anal gland expression, deworming, steroid. [x]
There is a lot more to say about anal glands, expressing them, and how to deal with anal gland abscesses, growth, etc. But as far as what you, the owner are "up against" the above is your set of 'marching orders'.
Expressing Anal Glands