Our lovely 12yr old collie has been diagnosed with mammary tumours, she is due to go in for an operation next week to remove them. Has anyone else been through this or any vets on here who could give us some advice. Specifically what we can feed her to help speed recovery from the operation, and if it is malignant what are the options available? Also an idea of cost of the operation, I didn't ask at the time as was trying to process everything the vet was saying, we do have pet insurance but I am unsure as to how we claim for all of this.