I’ve found my own blood works. Fresh tends to be key, I’m not sure animal blood would have the same effect, unless it was something you raised. Giving something you had no use for isn’t much of a sacrifice in my opinion, as in I opened up a pack of chicken and instead of pouring the blood down the drain, here, you take it Belial. Here’s a chicken I’ve raised and have a use for (eggs, breeding, etc) now that’s a sacrifice.
I haven’t been in the situation of using an animal for sacrifice myself, and for those of you that cringe at the thought of it, from my research unless it was an offering to a chtonic deity (which I would assume most demons would fall into that category) practitioners or adherents generally ate the animal afterwards. At least when it came to greek and roman culture.
Least those are my thoughts anyway.