If you have a Hulu subscription, you can get started right away because season 1 and season 2 are available. Seasons 3 through 5 aren't on Hulu, so you'll have to find them elsewhere, but oddly enough seasons 6 and 7 are on the streaming platform — so keep that in mind before you purchase them.
Of course, those middle seasons simply cannot be skipped. What's the fun of a Dance Moms re-watch if you miss Kelly Hyland's physical altercation with Abby Lee Miller, which led to an arrest (via The Hollywood Reporter) and Maddie Ziegler's rise to stardom thanks to her incredible performance in Sia's "Chandelier" music video (via Entertainment Weekly)?
You can buy the complete series on Amazon Prime Video, YouTube, Google Play, and iTunes. Each season is available for purchase individually, so if you do have Hulu, you can simply buy the missing seasons and save some money.
There's no time like the present to re-visit the most notorious fights in Dance Moms history, like Christi Lukasiak and Leslie Ackerman's brawl on the streets of New Orleans; Miller throwing water on Cathy Nesbitt-Stein because she "thought it would make her melt;" and Yolanda Walmsley choking Stacey Ketchman. After all, for the moms, dance is a contact sport.