We recently lost one of our 550 lb. steers that had been bought on Oct. 15th. It died Nov.27th. It had what appeared to be bloat but was very soft, unlike a grain or alfalfa bloat that is drum skin hard and tight.It also had swelling on either side of it's jaws and down in the brisket.It had labored breathing and was off feed. We gave it electrolytes via stomach tube, LA, Nuflor and Fluenaze to help with the breathing...but to no avail.We currently have one more in the sick pen with the same symtoms.It was purchased on Oct.29th. We have a total of 253(less one)head and they had been purchased in different groups between Oct.15th and Nov.7th and upon arrival are all treated with 30ml of LA, Ivomec, Blackleg and Pyramid 4. If someone can help explain what it is and what's causing this ,and a possible cure/prevention,it would be appreciated. Cattle are being fed good quality grass hay bales supplemented with a 13% pellet ration fed free choice along with cobalt salt blocks along with medi salt blocks. Cattle are all similar weights and they have access to a good water supply. We've never experienced anything like what these 2 have before. Last year we had 222 with zero losses. Cattle are on about 15 acres of space so overcrowding is not an issue. We are from Saskatchewan, Canada. We think it may be pnuemonia??