At home, I usually rely on the pits lined with punji stakes, the claymores with the trip wires, and during rainy season, 3 or 4 fougasse (2 of you are now looking up fougasse). And one little gray tomcat that will trip any intruder.
When out and about, well, you know, us seniors are broken down by age, abuse and neglect, and we do not ambulate as well as we used to- so we generally need some help. This one flies with me-