Mini or Standard

Hello all, Just trying to get an advice from you guys. I lost my standard Sheepadoodle to cancer and it was my first dog I have lost. I was looking online to see if a mini Sheepadoodle is also prone to cancer or lesser chance?

Read that smaller dogs are less prone to cancer versus large breed? Is a mini Sheepadoodle is still considered a large breed?

Sorry for my ignorance. I am trying to not repeat history because it was hard when I lost my dog due to cancer. It was normal vet visit and next thing I know he is in surgery and was told I need to put him down.