sometimes things that smell will work, mint chives etc..it will keep deer away from a lot of things too..see if you can find a smell the dogs don't like, an herb ..or try cayenne pepper..they might not like licking it off of their feet..

Ugh! I know your pain! Jazmyn loves to dig a nice cool den on warm summer days. She also likes to dig in the fall. The year before last, she dug up a single bed (in which I had planted 300+ spring bulbs) no less than five times! I kept having to go out and frantically rebury the dang things, and by spring time, it was the most random planting I think I've ever had! I have dealt with it a number of ways.

First, we have Invisible Fence. I called the company back out and had them add flower bed loops wherever possible. This wire isn't actually buried but sits just below the mulch (so I can easily find it when I'm planting and don't cut it with the shovel.) This might not work for you, as it would involve putting e-collars on all your dogs, but it has made certain beds of mine completely off limits in my dogs' minds.

Secondly, I buried some pieces of chicken wire beneath the mulch. I put them between the plants, was able to move them to plant more, and the plants come up through them just fine. Jazmyn hated it though, because her toes got all tangled up in it when she tried to dig, so she just gave up.

Lastly, I learned to embrace the junky look of random plant stakes. I took this photo just a couple minutes ago. In the bulb bed that Jaz dug up a zillion times before, I buried a bunch of tall stakes under the mulch, and poked a bunch of dahlia stakes randomly in the bed to make it inaccessible. They aren't too noticeable really, since they're green, far from the sidewalk, and in front of some green evergreen shrubs. As the plants grow, I'll just be moving them to support the Asiatic lilies that are planted in the area, and the plants themselves will block access, but for now it does look a little goofy... (not the greatest pic)
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I suppose you could always grow cacti or yucca or thorny plants, or even lay thorny branches in your flower beds to act as a deterrent. Some people (especially people with good-sized yards) will create a special spot in their yards where their dogs are allowed to dig.

Of course there are some dogs in this world that are so awful, they're just going to dig in your beds no matter what. I don't know what to advise in a case like that. Frankly, I can't imagine how a person could live with a dog like that! ;o)

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We have two acres and are surrounded on four sides by fields. The darlings are free to dig and lie around in 90% of the two acres and, of course, the surrounding 10,000 or so acres. They seem to want to irritate me.

Loved the pictures of your perfect pup. He certainly looks innocent.

Omgosh. That dog just cracks me up, and always has. Some dogs just have digging bred into them, ask me, I've had terriers of one sort or another for thirty five years. Schnauzers were bred for digging rodents out of dens. For some reason, though, my flower beds were never targets. He was hellbent on moles, however.