Thanks so much’.please what breed is him?

Please help me if you have any idea. The people I bought him from ain’t responding any more don’t know why.he’s also running temperature

I bought a dog online and since I have had sleepless night.I was told it was a Gsd but can’t say for sure now.issues is that barely eat, doesn’t respond to me tooo much but my girlfriend,even eats more when she feeds her.I don’t want her to go lean cus I was told by a friend that he would grow big. I’ve bought both Dry and wet food. He does have a liking for human food too.please what breed is he?? He’s three months old