My dogs are my alarm system... they save me tons in electricity... not only the system itself but also floodlights and sirens... they're also way better for the 'noise pollution thing' than a blaring siren that wakes the whole neighborhood... instead mine only wake me and we go from there... of course, stout locks and a weapons collection help too.
My dogs also save me from having to buy rat poison, definitely a bad thing to be having in your soil yes? So that's pollutants down.
They also eat leftovers (don't have chickens yet) so that's less that goes in the trash or down the disposal.
We don't do the sweaters and whatnot. They have collars, have to by law.
Don't have to bathe them often, short coats, but every now and again... certainly less than us people.
The 'fancy bed' for two is my hubby's recliner... for the little one who can't jump that high there's a old box, a natty old pillow, and an old raggedy blanket... she guards her 'bed' like it's bloody Fort Knox.
They don't really 'work' like herding dogs do for instance, but there are some little things they do to help balance.
At least, I think so. Ask me again next time I find a chewed up sock or shoe.