Two German Shepherds vs one

Question
Hello.  I currently own my 1st GSD and LOVE HIM!  He was 13 weeks when I got him and he still had two littermates to play with.  I also have a TCup Chihuahua and he wants to play with him so bad but he is just to big!  I was thinking about getting him another GSD as a playmate and companion.  I just worry, will mine stop paying attention to me and want to play with her all the time or will he still be the same lover I have now.

Answer
I would say wait until he is 8-9 months old before bringing a new puppy into the house.  That will give you time to have obedience training in good shape as well as housebreaking.  Puppies less than 6 months apart tend to bond to each other and not the the people in the household.  I base that not on a few examples from my personal experience, but the policy of the large dog guide school I raise puppies for.  They allow other dogs in the home.  We had our 14 month old with us today when we picked up a 7 week old.  We also have a 14 year old.  

You mentioned her.  A male and a female are the combination least likely to cause problems in a 2 dog household.  If you were thinking of a litter mate, no.  Actually 13 weeks is on the old side for proper bonding with people.  Put a couple of litter mates together now, and they could have problems bonding to people.  Not only was I given a 7 week old puppy today, I was given a service dog tag for her.  Tomorrow morning, we are taking her to church, and maybe to the mall and Wal-Mart in the afternoon.  We are allowed to do this because it is so important that dog guides grow up well socialized to people.  What works well with them, works with any dog.