
Always something new to 'learn', but I'd not have gone to 'mastitis' at this point, before the puppies are born. Yes, the milk may come down a few days before the whelping, but frankly I'd not want to see that because newborn puppies don't need tons of milk and yes, this can lead to mastitis, AFTER whelping. Have you been 'milking' her at all? If so, don't, much as right now, to confirm what's going on, have you tried expressing some of whatever is in there and seen what comes out (condition - pus, blood?) I suppose putting her onto antibiotics was okay but again, not something I'd have wanted. I think you really should leave well alone now and hope once the puppies are nursing, all this will sort itself out. Unless she's uncomfortable and deteriorates of course in which case it's back to the vet or have him come to you given how close to whelping she is!