However I often see people having some difficulty rehoming their pigs even when asking for an adoption fee.
Would it be advisable, or, indeed, even acceptable, to refer people to this board to find new homes for their pigs? Would they still be allowed to ask for a rehoming fee?
Also suggest contacting a local rescue for ideas for finding homes for a guinea pig. If they have a vet, maybe they have a placement board for pets (hopefully finding someone responsible).