Heather and Reba,

What you are describing sounds like pappiloma virus.  You can find quite a bit about it with an internet search.  If it is that it will resolve itself in a period of time.  Codie Rae had a horrible case, where her black lips were covered in white bumps, shortly after she arrived here.  In her case the vet gave a course of antibiotics and she got over it in a couple of months.  My understanding is that dogs are most susceptible when there immune systems are compromised, which was the case with Codie Rae at the time.  She was having suture reactions, along with battling tape and round worms.  If it is the pappiloma virus the vet can easily diagnose it and make a treatment recommendation.  Reba could have gotten the virus almost anywhere she was around dogs, as it can be fairly contagious. 

On Reba's diet others can comment better than I about the diet/cancer connection.  With any tripawd you want to keep the weight under control to make it easier for them to function. Better a bit underweight than overweight.

I would be a genius if I could spell papilloma!

Codie Rae, I think you should change your signature to say "Woohoo! Tripawd Wonder Girldogs With Two Names Rule the world!"

And if Reba is Reba Sue she should definitely join! Hmmmm gives me an idea for those cool trading cards Cemil had....