Citations:dogter

English: "one's pet dog, mentioned as though it were one's daughter"

• 1996, “You Know the Day..15 year old Vent”, in misc.health.infertility‎^[1] (Usenet):

  She and my other "dog-ter" are what I got from the relationship

• 2000, “Got to take my dog-ter to work today!”, in alt.support.childfree‎^[2] (Usenet):
• 2003, “OT: my horse”, in alt.support.lupus‎^[3] (Usenet):

  currently going through a rough time with my 9.5 y.o. dog-ter, Bayta

• 2008, Lisa Wogan, Dog Park Wisdom‎^[4], →ISBN, page 152:

  Since then, she has taken her "dogter," sometimes sporting heart-shaped sunglasses and a pink visor, everywhere.

• 2013, Ross Matthews, Man Up!: Tales of My Delusional Self-Confidence‎^[5], →ISBN:

  I dropped everything and raced to my prospective new dog-ter's side.

English: "doglike daughter"

• 1998, “Cook-a-Thon & Freeze Ahead Dinners (Recipes)”, in misc.consumers.frugal-living‎^[6] (Usenet):

  My Mum used to refer to me as her "dog"ter, because she always made me go "fetch" stuff for her

Middle English: "daughter"

Probably just belongs at doȝter, not "dogter", even though Google Books treats those as equivalent?