At the corner of my street I have just passed a tallish, thin young man with mousy hair and a sparse beard. He had a...I'm not sure what to call it, a tiny fluffy pug-type of dog on a lead. About nine inches long. Another man came by in the opposite direction with an equally small something else on a lead. The fluffy pug thing set up a furious barking (although in its case there should be a better word) and but for the constraining lead would have attempted a vicious assault.

'Gatsby!' reproved his man, pulling him away.

Gatsby??