He almost says he'll have to make sure that none of the kids are around, because he doesn't want them to be as wary of him as Peter ended up being. (Though, so far, with the different circumstances his relationships with most of the children on the train have turned out well.)

But then he mentions the dog and he remembers that whatsit that Aziraphale showed him, and he pulls a legendary face.

"The Wobbledog? Ferdinand or somethin'?" Was that his name? Hell, he doesn't remember. But wiggles his fingers and scrunches up his face as he remembers bizarre feeling off-putting toothless nibbles.

It was harmful. He doesn't hate it. He doesn't love it. He just found it strange as all hell. "I guess if it works." Best that the strange toothless creature get some sort of use?