Oreo’s cancer treatment

Hi my name is Leonna. Im looking to raise as much as possible for my mums dog Oreo-Joe who has recently been diagnosed with cancer! We got him and his brother after my grandad passed away because it felt like it was meant to be, as the breed were my grandads favourite. We have insurance but they will only cover £4000. Oreo-Joe is a cocker spaniel and he is one of a kind. He is 5 years old so he should still have a long life ahead of him, however we have been told he does have mast cell cancer. We are not people who would usually do things like this but with how special Oreo-Joe is to our family we would like to make sure we can give him the best treatment he deserves! Any help would be massively appreciated, especially in the times we’re living in! We did ask to increase his cover but unfortunately the insurance company wouldn’t do it because of the uncertainty of Oreo’s illness. If you can spare anything at all my family would be greatly appreciative, we understand the cost of living etc so any help would go towards giving Oreo the best care and trying to give him the best life he can get! The money will be used to help with his treatment from vets and any medication he will need.