What breed of dog is the best-suited for me?

You know I lost my Mags on the 8th and I’m on petfinder.
No beagles – no digging
no terriors – no crazy insanity

I want an adult dog, that knows good from bad. retired greyhound?
I have fibro and have some bad days…but a fenced in yard. Want a dog to protect me, but gentle and loving. and laid back.

Is there such a breed?