Said nonsense is, as we all know by now, Elly flipping out because Mike tells her and John about the puppies.
Panel 1: Mike bursts in the kitchen and tells John that Mrs Baird's sheepdog had puppies and said that they could come see them, daddy, daddy, PLEEEEEEASE, can we go?!?!?!?
Panel 2: As he puts his coat on, John reassures danimal-hater Elly that he's just going to look.
Panel 3: That's all well and good but if he comes back with a filthy, nasty, disease-spreading fur-pet, SHE QUITS!!!!!
Summary: We all know how resolute she ends up being despite tomorrow's epic piece of tension wherein she worries that Mike and John have been gone long enough to actually want a dog. All Mrs Baird has to do is tell her a flat-out lie.