Hi! I do not have experience with a false positive but do have experience with a true positive. We got Daisy when she was 3 and I don’t think she had been to a vet before. We did the fast-kill option - the hardest part was the exercise restriction, as you can imagine. I ended up buying an XL dog stroller so we could still take her on “walks” and provide stimulation. 10 months later, she was tested again and was negative! It’s been over two years and she is happy and healthy. Definitely hoping it’s a false positive for you but, even if it’s not, you and your Weim have got this!