Eddie went to the vet for his routine blood test last week. Although he has remained on the same dose of thyroxine ever since being diagnosed three years ago, this time his T4 was at the top end of the range. Vicky vet suggests leaving his thyroxine dose unchanged for now, but reviewing it if it is still high at his next three monthly test. For most of his life Eddie's weight has fluctuated between 17 and 18 kilos, so I was shocked when the nurse told me that he was now 19.02k! I do remember Myra commenting that he looked chubby when I posted his 10th birthday picture, but I parried the comment by saying that he had got a waist, but had always had a broad ribcage. With a high T4 reading I would have thought that he would have lost weight rather than gaining it, so I'm feeling a bit confused. It is time for some honest opinions. Am I just fooling myself - or have I let Eddie get FAT? If not, how has he gained 1.5k in 18 months?