When I got my WGSL puppy, my golden retriever hated him. With a passion. To be fair, he was an obnoxious brat and it took a while for him to calm down and leave her alone. It took over three months before I started to notice that she was starting to like him. She would actually let him lay within 5 feet of her! By the time he died 5 months after coming home, she did like him, and we noticed that she missed him a lot as well. She still wags her tail ferociously whenever I get out his old collar and let her smell it. It may take time for your dog to like the new pup.
Forrest - GSD 9/1/2016 - 5/14/2017 RIP
Brooklyn - Golden retriever 1/30/11