I just saw this thread. I am sorry for your loss of your grandfather and also sorry you had to give up your new little pup.
I dont have asthma but I have severe eye allergies to our little guy and we just got him about three weeks ago. Cant take a lot of allergy stuff.
I am hoping when he grows his baby coat out it will get better as we have a two year old yorkie and no problems with him.They say yorkies dont have dander but this little guy sure does. We clipped him down and he has dander. We wash him once a week and do the dog wipes ,vacuum etc etc but i still have a lot of trouble.
Anyway all the best to you .Giving up a pet is so hard to do.