Likely because they need their anal glands expressed. If your dog does this consistently you should take it to the vet or at least a groomer, who can express his anal glands before it ruptures and you have to get a painful, costly and messy surgery. You can learn to express them yourself if you're not to squeemish, it's very easy.
Some dogs cover their 'mess' so you dont have to worry about seeing it and to keep it from other animals. My shih tzu does this alot.
wolves do this to cover there sent so that the animals they hunt will not be able to smell them. domestic dogs do this because of there wolf ancestry
To cover it over. Its part of their nature.
To spread their scent about.
to digest properly
Yes, all dogs urinate.
Urinate.
Dogs sometimes have urges to urinate where other dogs have...it's nothing unusual
Yes.
A scrape is in the ground with their feet, and a rub is on a tree with their antlers
they don't urinate on their food or drinking water
Dogs urinate, defecate and respire, these are all forms of excretion.
Dogs urinate, defecate and respire, these are all forms of excretion.
Their bladder tells them "it's time"
no
i dont think dogs or any animal, is supposed to do that!
Their scent.