Honestly, there is no need to constantly have access to a rifle on your person. Every snake that I've encountered has either slithered away or was 'basking' and I just walked around it.
That isn't to say that we don't have access to firearms, here in Australia. They're just kept in the gun-safe until required... which is mostly for hunting or culling purposes. Culling is required due to the lack of natural carnivorous predators that you would have in North America (bears, wolves, coyotes, etc...), so we're mostly taking care of an overabundance of kangaroos/wallabies or feral rabbits. [Although, baiting and/or a released virus is predominately used for that] There are
no foxes on the island State of Tasmania and we're extremely vigilant about keeping it that way.
There are feral pack dogs that need to be destroyed.
Another point that you may find hard to believe is that there is no rabies in Australia. No rabies means, of course, that there are no rabid animals to deal with. Keeping Aus 'rabies free' means strict and enforced quarantine laws (just ask Johny Depp & his wife, who tried to sneak in their two little dogs on a private plane.

).
Personally, I am very familiar with both handling and shooting a variety of firearms due to my 35+ years of Navy service.
I was honest with my initial comment on the OP's question about if
I'd ever thought of carrying a pistol whilst on my tractor. The OP wasn't being specific about where in the world his question applied too and, last time I looked, this isn't a U.S.A. exclusive website (I'm not having a go at you 17 Oaks, that's just a general statement).