I have a Hafflinger on loan and have been hunting him all this winter. He came off the lorry on Tuesday very stiff through his hindquarters and sore. He went on ok and was heard bashing about in the lorry about 15 minutes before we got home. He was very uncomfortable and couldnt put his head down to the floor. We gave him electrolytes, added water to his feed and gave him bute. He had two days box rest and bute. Then two days restricted turn out and then today no bute and turn out in the bigger field with my other horse. He was observed during the day by someone on the yard looking stiff and lame. When I bought him in this evening he was stiff, subdued and had a fluid filled lump on his chest and more fluid under the skin between his legs. He also has two pus filled lumps (very like bites) on either both shoulders, almost in the same place, just forward of where the saddle flaps would be. I spoke at length to the vet who couldn't work out what the problem might be. He has two more bute tonight, some antibiotic cream to be picked up tomorrow for the pus filled lumps and if he isn't any better he will take some blood. Anyone got any ideas what this might be about??