The Sanctuary Solidarity Project strengthens the capacity of under-resourced animal sanctuaries through media amplification, capacity building, infrastructure support, volunteer mobilization, resource organizing, and cross-movement solidarity. Centering the challenges faced by marginalized sanctuary leaders, we highlight how race, class, gender, queerness, and other structural inequalities impact animal rescue work. We foster cross-movement solidarity and connect sanctuary work with audiences beyond vegan or animal advocates. The project prioritizes undersupported animals, including both farmed animals and animal companions, and the dedicated community-based organizations that care for them despite limited access to funding and visibility.