First the good news. I finally found my Brown Swiss. Sophie is 7.5 years old. She was raising 3 bottle calves for her previous family (kind of skinny now). She is a real sweetie: halter broke, no fuss at milking, hasn't escaped her pen. Now bad. I got her Saturday morning and by Sunday night her back left quarter was hard. Monday morning showed clots in that quarter's milk. The vet came out Monday around noon. He started her on a 3 dose treatment of DairyClox (cloxicillin). Monday night the left front quarter was now hard. I used one of the tubes in that quarter Monday night. The back left quarter was getting softer by Monday night. Tuesday morning the left front was swollen and the "milk" was mostly a light brown water, it felt feverish and she was sensitive to milking. I called the vet again. He had me come in for more DairyClox and an IM injection of penicillin. Wednesday morning the infection appeared to be breaking up in the left front. Lots of large clots came out. The milk still appeared to be mostly serum. Now, Friday morning, the rear quarter is almost normal; I can still feel some more firm areas of that quarter, but the front is still quite swollen. I got a few small clots out this morning. The milk has started to look like milk again. I have been milking these two quarters 3-4 times during the day and massaging these quarters. She is acting fine: eating, no complaints when I milk or massage these quarters now. My question: is this mastitis clearing up or do I have an organism that is resistant to penicillin? I was expecting to see the swelling disappearing and no clots. I am not real confident in this vet. He didn't want to give LA-200 because of the 28 day withdrawal on the milk. After he left I checked that info. It seems to me that it is 96 hours withdrawal on milk and 28 days for slaughter. If it helps her are pictures of her two front quarters for comparison. Right Left Thanks much for your input. Erica.