Nope. Go to the vet. Take a fresh poo sample with you.
Hard to tell. How old is your dog? How long has this been going on? Have you changed foods or treats? Has the dog gotten into anything it shouldn't have? Has your dog been wormed? Have you had a stool sample done at the Vet's office?
You can try fasting for 24 hrs but make sure the dog is taking in water or Pedialyte. This will give the gut a rest. Start feeding chicken (no skin) and some rice, a few small meals spaced out. If the dog seems better,mg radially start adding in kibble.
Of course, if the dog seems worse, the stools get worse or have blood in them, if your dog seems to be restless and in pain you need to get an evaluation from your Bet who will probably do blood work and check the stool.
Hopefully, it is just a digestive upset.
Good luck and please come back to update.