My labs got cancer of the spleen when they  were ten years old and whenever 
the cancer would break open and bleed,  they'd have very pale gums and 
everywhere that you could tell which was  supposed to be nicely pink.  Then a 
couple days later, the split  would have sealed up and they'd have enough red 
blood cells and be back  to their natural coloring and feel well again.  Your 
cat is young  though and I don't really know about anemia in cats.  There is a  
problem called feline infectious anemia which is curable.
                                                                                
      Pat
  

                
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