[Tank's Grandma]

What kind of surgery are they suggesting that they want to wait another 6 months?
Do a google search of TPO surgery (triple pelvic osteotomy) it is a hip surgery that corrects severe hip dysplasia, but it must be done before there is too much damage to the hip socket, usually best done BEFORE the dog is 12 months old. My dog was 8 months when diagnosed and it was too late in onehip and we caught the other in time.
If you haven't seen an orthopedic surgeon for this diagnosis and discussion of surgery, I would do so now for the best options for your dog.
Cindy