she could ask bessie if joe had had a tractor tire with him when he came up 'yesterday or the day before , ' and if bessie said why yes , now that you mention it , he did , that would mean that joe had n't been up to see alva since last thursday , which would mean that joe had n't asked alva to feed cujo , which would also mean that alva would n't have any information about cujo 's health and well-being .