My sulcata is waaay bigger than my dog. About 56 lbs heavier than the dog so I don't worry about the dog harming the tortoise, I worry more about the tortoise ramming the dog.
We lost our old dog in May, he was very sick and on a lot of medication- thyroxine, mitotane, enacard and Interceptor, so I made sure I pooper scooped as soon as he did anything.
In a healthy dog heartworm medication is a huge concern for keeping sulcatas and dogs in the same yard.
Heartworm prevention medication that contains ivermectin can kill your sulcata. Ivermectin leaves a dog's body through the feces, sulcatas like to eat feces so that's a deadly combination.
You need to be sure that your dog takes a heartworm preventative that does not contain ivermectin. I believe there are only 2-3 that don't have ivermectin so be sure your vet prescribes one of the brands that doesn't have it.
We bought a new baby dog on the 23rd of June, he's getting along fine with the sulcata so far 

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PHRatz