When I brought Baxter home at 13 weeks (yorkie) my Lhasa Zeke who was 5 hated him. I mean HATED him. Zeke took 3 MONTHS! before he would go into the same room as Baxter. Then when he started being in the same room, Zeke refused to look at him. He would actually look and turn in the other direction is the baby came into his vision line. Well about 5 months in, I saw Zeke actually play with Baxter for about 5 minutes! Now Baxter just turned two and Zeke is almost 7, they play every day, they lay together, and Zeke is soooooo afraid that Baxter is going to get extra attention, they race each other all the time, to see who gets loved first.
Baxter was so good for Zeke, it brought out the playfulness in him again. I would do it all over again, but pray it wouldn't take so long.
So you are actually doing well if it is less than 2 weeks and they play occasionally. GOOD LUCK!