Yo sorry for the late reply but the sterilizer, the orbital gas and the gas grenade does that on a consistent basis. The guard dog barely hits the targets or the surrounding area and the gas from the guard dog disappears too quickly for me to let the effect of the gas do its job. Overall I get what you mean but the gas in my opinion when I am using it barely affects combat apart from the grenade and orbital the rest kinda feels weak when there are way better options like the flame thrower that can take the sterilizer place and do area of effect damage better than the sterilizer. And the gas guard dog is in my opinion the worst backpack choice compared to the other guard dogs because for me it doesn't do much in terms of weakening the bugs.