[anonymous]

The vet thinks that the dog cannot tolerate surgery? Hello!
I have had senior sick dogs glide through major surgeries, no issues.
Ps: “thinks” does not = diagnosis. Obviously the vet would like to do some more testing, not sure any was done anyway.
“Her vet believes the dog has either IBS or IBD”. Yeah, only additional testing will confirm or rule out.

Ps: The longer the OP waits to get her dog diagnosed and treated, the lower the chance for a positive outcome.