Found a dog, let's get them home!

Large black dog with tan markings found in Midtown. Has collar and microchip, but the registration is a bit odd and may be for a shelter that is closed until Monday. I do not have the microchip number, the vet isn't allowed to give it to me. Must confirm gender and describe collar. This seems like someone's baby, help me get them home. I cannot keep them and will have to take them to the shelter on Monday.