I think the breeder is responsible and needs to take the dog back until they can find a suitable home. With as much care, if not more, as when they find homes for their new puppies.
We need to be realistic no-one has a never ending supply of space, money and time it would be unfair to the dogs to take in more than a person could cope with.

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.