Neighbour tree laws

Just curious on how to proceed and what the laws say

We have a relatively unfriendly neighbour who doesn't generally keep up on their property maintenance (or I would've chatted with them first) and they have a tree in their backyard that looks like it's becoming a hazard

We have a little overhang from some of the wispy branches, but there's a fork in the tree with a large hole (currently being inhabited by raccoons) directly at the crux of the fork. If the large limb were to come down it would almost certainly fall on our house and cause significant damage.

I'm not an arborist and I don't know if I can call one because of a neighbors tree if it isn't directly overhanging our property to assess if it's even a risk

Id love some insight or advice from anyone with experience with this sort of thing