I definitely appreciate the concern, I've learned so much since joining, so thanks for all the great advice thus far. I'm glad there are people like you all willing to say something that probably makes most people bristle and take offense, and stomp off in a huff...lol.
I would be willing to bet just about anything that the tortoise is perfectly safe with the dog, but I think I'll just take your advice anyways and rig up his pen to be dog proof, for use when they are both roaming the yard unsupervised.
Do you think once the tortoise is larger than the dog, which should be in a few years from now, they'll be trustworthy together? Dog's head is practically the same size as the tortoise, and she's done growing. I've just put so much effort in to making the backyard a tortoise haven, where he finds plants to eat, different bushes that he's dug hidey holes, etc.
Again, thank you all for the concern and suggestions, and I don't want to come off as someone trying to argue or get away with something that you all say is a bad idea, and perhaps I am and just don't want to see it ...lol. I want the best of both worlds I guess....happy healthy tortoise, and harmonious existence with my little dog who shows the tortoise respect, when she pays it any attention at all. Have a great rest of the day!