Is the buyer entitled to claim the price of the sheep after slaughtering it and discovering a disease that renders it unfit for consumption?

The buyer is not entitled to return the sheep if there is no evidence that the seller knew of its illness, or if the seller does not admit to it. This is because the mentioned defect cannot be discovered until after the sheep's condition changes, and because the passage of time after the sale may result in an illness that was not present at the time of purchase.