I apologize if you have all seen this before. I couldn't find it in the forum search function.
This patent application is too long to post here. But it's worth a look. The pdf version of the whole eight pages is at
Bear Patent Link
Here is the first page:
There are 16 claims. The first one reads like this:
1. A portable device for deterring an attack by an animal upon a user, wherein the device is easily carried by a single user, the device comprising an inflatable figure that increases rapidly in size upon activation by the user, thereby scaring the animal and deterring the attack upon the user.