Hi Enger!
We're in the same boat. We're foster-based too, but we focus specifically on wolfdogs-which means our needs are pretty niche when it comes to enclosures and medical care, so our costs look a bit different.
I've found very few grants that support startups or grassroots rescues, but one I did have success with was The Binky Foundation. They're one of the very few that explicitly fund new organizations. It's only $1,000, but it's also unrestricted-which is rare and super helpful!
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Leah Collingwood
Founder and Executive Director
Cavalli's Husky and Wolfdog Rescue
https://cavallisrescue.org/------------------------------