Gorilla Tape is a duct tape that we have added an aggressive rubber based adhesive and a thicker cloth backing.   Pulling it off will hurt and remove fir!   However, it is not waterproof so soaking in hot soapy water will eventually break down the adhesive.  Rubbing alcohol, gasoline and paint thinner will also dissolve the tape but all of these solutions are not something I can recommend since she recently had surgery and has a healing incision!

I can only recommend contacting your vet and see what they would suggest you do.