Re: Yeah - but if I am a "common criminal" I'll definitely find another non-indiegogo to pawn
A pair (male and female) of these is as effective as two 24x7x365 guards armed with submachine guns.
Really? What if the attacker is, oh, let's say, in a car?
Mind you, I'm not advocating for attack dogs or attack humans. But I think your threat model is a little simplistic if it finds those two mitigations equivalent.
(There are, of course, attack classes in which the dogs are more effective. They're less susceptible to threats against family members, for example.)