You know all that doggy butt-sniffing that we humans seem to find either appalling or hilarious? You may not think of that dog in your bed as a predator, but at heart, he is. And like all predators, your dog has anal sacs anal glands located on both sides and slightly below his anus. They produce fluid with a distinctive odor that identifies him and tells other dogs his sex, approximate age, health status, and other things.
To help the anal glands to function properly, dogs need to consume the right amounts of fiber. Sadly, due to a lack of good fiber in the average canine diet, many dogs have to have their anal glands expressed manually … meaning the vet or groomer squeezes them by hand to get the fluid out. You know your dog marks his or her — girls do it too! Dogs have two small glands on either side of the anus.