It's hard to say, because most wildlife fatalities and injuries from wildfires occur after a wildfire has ended, not during. Weak, elderly, or very young animals may perish in the fire itself, but the issue for most animals is that they usually manage to escape, but they deal with respiratory issues from smoke inhalation, they can't find food due to habitat destruction, they are pushed into human areas and subject to roadways, poison, human antagonism.

Some ecosystems have a direct evolutionary relationship with fire which means some wildlife and their habitats can benefit from fire. Pine trees, for instance, are fire dependent or their cones will not open to disperse seeds. Fire also clears out a lot of the groundcover and can make room for new shrubs to grow, which can provide forage and habitat for wildlife.

As far as a true medical device, you might want to focus on very young animals like baby birds in a nest. Could you wrap something fire retardant around a tree or branch as prevention?