How do you cure perianal fistulas in dogs?

Answer:
If that is what the problem is, then the dog will need treatment by a vet and probably antibiotics at a minimum. If you have not had it diagnosed by a vet or had a knowledgeable breeder, groomer, or other dog expert look at it, then what you are detecting may be some thick "drainage" from the dog's anal sacs/glands.

If the dog is scooting on the floor, licking there a lot, and/or you smell a strong, musky, foul (almost skunk-like) odor, it may be that these glands are impacted and need to be expressed. The thick liquid is used for marking territory and usually gets emptied as the dog defecates, or sometimes the dogs can empty them at will. If they can't get them emptied then you see the behavior and smell the symptoms.

There is a link below to an animated web page that shows where these glands are located on the dog and tells all about gland impaction in easy terminology.
First answer by D4est. Last edit by D4est. Contributor trust: 1251 [recommend contributor recommended]. Question popularity: 5 [recommend question].