Magnum - Lost Dog: UPDATE

I live on Wainwright Ave and him and his sister were both let out around midnight last night to go potty. They never came back. His sister, Heidi (a 9 month old lab) was found hit by a car on Old Ocean City Rd headed north just past Walston Switch Rd at around 8 am this morning. I had to have her put her down because she had a broken back. I have 3 small children who got Magnum as a Christmas present from me last week and are already very distraught from the loss of Heidi, so hopefully someone know where he is!! He is on medication that he desperately needs!! He is a very easy going dog and has on a red collar. We were going to take him today to get his tag for his collar. He is UTD on all shots and was neutered on 12/4/13. My email address is concal0205@hotmail.com and my cell phone number is 443-783-9729.