She was healthy happy bouncy chocolate lab and we loved her so much, she woke on weds with what we thought was a stiff leg took to vet who confirmed, but her demeanour was wrong head low, didn't get off her bed, got so stiff in two days, couldn't stand without help , back to vet told keep moving 10 min walk.no better back to vet, tests showed nothing then, hypercalcimia, but still couldn't find cancer, more tests. All the time our little girl was getting weaker, lost fur on muzzle slowly swelled, nose changed. Admitted to hospital more tests, then a week later no cancer rare auto immune disease, manage with steroids, that was Friday, Monday call she could come home, my poor poor girl looked so frail, thin, face and eyes covered in swelling and lesions but she was home we had mess she was going to be ok. Then breathing seemed different laboured rang vet take back to hospital, by time I go at her there she was so unwell, Rushed her away, Blood clot on lung, didn't respond to oxygen, I had to say goodbye, cuddled her until she was gone. But our hearts are broken and a light has gone out, we don't know what to do with ourselves. I worry we let her down, didn't push hard enough with vets finding a cause then she was too weak.