Good morning!
Not with little Harry, but Rosie our lab was VERY prone to fatty tumours, especially as she got older. I think we had 4 removed in total - they were all benign, but all quite huge....
It seemed like the vet was always whipping one out then stitching her up....then the wait for the results - yuck. She had to wear her 'collar' for a week or so, then all was back to normal again.
I really hope all goes well for you
Sally + Harry x