I am posting here because I feel absolutely heartbroken. My seven-year-old labrador has just been diagnosed with a mast cell tumour. It's on his front leg and it looks like they cannot operate because of its location. My 12-year-old daughter is in bits because he is limping. She doesn't even know it's cancer yet. I'm absolutely heartbroken. He is struggling to walk today and it's breaking my heart. Any one had experience of this or any positive stories?