The Kangaroos and Sydney, who downed St Kilda by 23 points, are equal top on Saturday night, undefeated after three rounds.
Also Saturday, Adelaide's first-year coach Ryan Davis celebrated his first win, a 17-point victory over West Coast.
North, with Blaithin Bogue, Alice O'Loughlin and Kate Shierlaw kicking two goals each in a 11.4 (70) to 3.5 (23) triumph against the Dogs in Launceston, stretched their winning streak to 30 consecutive matches.
The Kangaroos continued their hunt for a third straight premiership in Tasmania, and accelerated from the previously undefeated Bulldogs after a tight opening.
The Roos led by one point at quarter-time before seizing control with eight of the next nine goals in a contest marred by a horrible jumper clash - both clubs in predominantly blue and white guernseys, and blue shorts.
"To be honest, it was really challenging at times," North's Shierlaw told Fox Footy of the kit clash.
Bogue, O'Loughlin and Shierlaw flourished in attack, fed by a dominant midfield led by megastars Ash Riddell (32 disposals) and Jasmine Garner (27, one goal) were outstanding.
The Dogs slipped to their first loss of the season, despite the best efforts of Isabelle Pritchard (21 touches), Jess Fitzgerald (22) and Jasmyn Smith (18).
North led 1.2 to 1.1 at quarter-time and kicked three goals to one to seize momentum and create a 14-point halftime edge.
The competition's benchmark steamed further away in the third quarter to hold a 30-point advantage at three-quarter time, before cruising to victory.
In Adelaide, the Crows logged a hard-fought victory over West Coast, 9.6 (60) to 6.7 (43), in a clash of previously winless clubs.
Adelaide set up the win with six goals to two in the second term, creating a 27-point halftime buffer.
And with stalwart Ebony Marinoff gathering 26 disposals, laying 15 tackles and kicking a goal, the Crows held off a plucky Eagles outfit in the second half.
Marinoff, Madison Newman (23 touches, one goal) and Grace Egan (two goals) were standouts for the Crows.
West Coast suffered a third straight loss despite the impact of Ella Roberts, who collected an equal game-high 26 possessions, Charlotte Thomas (22) and Isabella Lewis (19).
In Coffs Harbour, the Swans kept the Saints goal-less until the final term in a 5.8 (38) to 1.9 (15) result.
St Kilda's Alice Burke suffered a right knee injury in the third quarter, with the 23-year-old helped from the field by medicos.
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