Thank you for your interest in adopting.
Every dog is spayed or neutered, up-to-date on age-appropriate vaccines, microchipped, multiple dewormings,...
Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.