From the album songs
This is about wanting permanence with someone while being terrified of your own capacity to destroy it. Lenker writes from inside the paradox of craving total intimacy while knowing exactly which parts of yourself could ruin everything. The dog isn't protecting her from an ex. It's protecting her from the parts of herself she stopped believing in.
Through your eyes I see / A smile you bring to me / To your joy, I tether
She only sees herself reflected back through the other person. That word tether is doing a lot. It means connection, but it also means restraint, like she needs to be anchored to their happiness or she'll drift somewhere darker.
My dog barks wildly / To protect my infancy / From my ex-believer / And I try to calm the wolf / To remind her I am both
The dog is her own protective instinct going feral. The ex-believer isn't a person. It's the version of herself that stopped believing in goodness or safety or whatever she lost. She has to remind the animal part of herself that she contains both the threat and the person being threatened.
And your dearest fantasy / Is to grow a baby in me / I could be a good mother / And I wanna be your wife / So I hold you to my knife / And I steal your letter
This is maybe the best writing on the album. She pivots from tenderness to violence in two lines without changing tone. Holding someone to a knife while wanting to marry them. Stealing their letter, taking their words, their fantasy, and turning it into something sharp.
So I bash around the house / And the poison stains my mouth / She comes, I let her / And we share a paradise
She stops fighting whatever destructive thing lives in her. The poison could be substances, could be intrusive thoughts, could be self-sabotage. She lets it in and somehow that creates paradise too. The song refuses to separate the good parts from the broken parts.
Not a lot, just forever / Intertwined, sewn together / Like the rock bears the weather
The understatement is the entire point. Not a lot. Just permanence. Just everything. The rock doesn't resist the weather. It just endures it, changes with it, stays.
You walk away unsure if this is a love song or a hostage situation, which is probably the most honest thing you could say about wanting to build a life with someone when you don't entirely trust yourself. Lenker makes forever sound small and huge at the same time. Not a lot. Just everything.