Hi Blondee! I honestly don't know the answer to specifically being around a dog going thru chemo..but in general I wouldn't take a new pup around anyplace where other dogs are until their entire series of vaccinations are one. not JUST the dogs..but the Enviroment where other dogs have been. I think it's about 3 plus months before they are fully protected. My vet said absolutely no to even our own unfenced front yard. I would say better to be safe than sorry!
I did you already..but I can't wait to meet your new family member!