So far there isn’t a way to change your review that I know of, however you get to leave 2 separate reviews, one directly after purchase and the other I believe a fortnight later. After that I think all chance of rating and review are gone.
I can see there being risks depending how long you can edit your review. Think to Buyer complaint of animal dying a month after receiving shipment …
A lot of people won’t own up to their own mistakes (I’m not in any way relating that to this thread), especially if it was the cause of death to their pet. Having someone to blame makes dealing with loss a whole lot easier.
Sellers ratings will take the brunt of a lot buyers mistakes.
Personally, if this one is all around healthy and eats, I wouldn’t strike the breeder off completely… Just bump them down my list.