Groundwire,Matsi is a beautiful girl,your story tells how much you love her and I think most of us here understand how strong the love for our animal-friends is.
I am hoping Matsi does not have Cancer,I could not really see if there was a definete answer.
We have several people here who have dealt with cancer in their animals,myself included.
Losing an animal to this horrid disease is heartbreaking,but something we have to deal with,I only hope you have a lot of support to carry Matsi and yourself through this.