Green’s Dictionary of Slang

1. cheating.

1864, 1867, 1870		Hotten Sl. Dict. 122: doggery nonsense, transparent attempts to cheat.
1873		Sl. Dict.
1878		Staffs. Sentinel 1 Jan. 4/2: The assaults arose out of a pony selling transaction [...] there being some alleged ‘horse doggery’.
1879		Hastings & St Leonards Obs. 7 June 2/7: Between you and me, George, your doggery over that little affair has disgusted no small number of Rads themselves.
1966		P. Boyle At Night All Cats Are Grey 45: There’s no rhyme or reason for a doggery the like of this.

2. nonsense.

1889–90		Barrère & Leland Dict. of Sl., Jargon and Cant.
1899		Hull Dly Mail 17 Jan. 3/3: A Councillor said: I object. That’s what I call doggery.