I can't see the pictures, they are not completely loading on my screen. But swollen toes are fairly common in this house. Sometimes they go back down, and sometimes they remain swollen. I've never had a dog refuse to put weight on the foot, though. While cancer is always a possibility even in a toe, it's more likely to something less serious. The vet should be able to get a good x-ray of it. Hugs to your girl.