Black Lab-type dog - maybe Bruno?

I recently saw quite a few posters in San Antonio about a lost dog. I think his name was Bruno.

So today a big black dog trotted up to me as if he had been waiting to meet me, and he followed me for a looong time - all the way through La Floresta to our house in SAT. He looks like the dog on the poster. He is neutered, looks well-fed, mostly black with a little white on his hind feet and more white on his front feet, and a white patch on his chest which isn't always visible when he is standing up. When I got home, I let him in the yard and went out to look for the posters to write down the contact number.

I walked all around SAT looking for those posters and can't find any. No lost black dog posters at Walmart or Superlake. So if I have found Bruno, I have no way to contact his owners. HE looks like he will be happy to live with me forever, but I'm sure his owners (and my husband, and our yard cat) will not agree.

So if anybody knows how to get hold of Bruno's owners - please PM me ASAP! I will let him stay with us until tomorrow but then out the gate he goes - because if he isn't Bruno, then he's not lost and I'm in illegal possession of somebody's pet.