How do you keep a dog from digging a hole in your flowerbed?

Pick up their poo and bury it (not very deep -- just a few inches) around the bed. They will not dig up their own poo.

Sprinkle cayenne pepper

Mix a solution of hot peppers and water to spray the area. Dogs do not like the smell.

Most dogs dig out of boredom, or to get to a neighbor dog. Give your dog something better to do, and bury his scat in the hole he digs and cover it lightly. He won't want to dig there again!

Train your dog (s), plain and simple. It is a dogs instinct to dig. Chances are they are bored and need far more exercise. Here are some fantastic tips!

http://www.humanesociety.org/animals/dogs/tips/digging.html

https://www.cesarsway.com/dog-behavior/obsessive-behavior/getting-a-dog-to-stop-digging

https://www.akc.org/expert-advice/training/advanced-training/how-to-stop-dogs-from-digging/

I have 6+ dogs in my yard everyday and they have all been taught not to dig. They all get regular exercise too, be it long walks, run on the beach, playing ball in the yard, something.

Thanks all, for your input!!

A couple of suggestions:

1. Put down black pepper where your dog digs-just sprinkle it, it will sneeze every time it digs there and then will quit.
2. This way is a bit gross...put some of your dog's poop where it dug and cover with soil, after a couple of time the dog will stop-hopefully. You could make a sand box area giving the dog a place to dig that is acceptable to you.