Dibbley the Staffordshire bull terrier was found in a property in Chesterfield.
Bichon Frise Oscar was in such a bad state that his entire body was covered in clumped fur.
Boris was brought into RSPCA's Little Valley Animal Centre in Exeter.
The animals were found sealed in a box with no food or water.
It is suspected that the animals were deliberately killed by anglers.
The shocking incident took place in Chester Park in Chester-le-Street.