Hammerboy217:

yeah, that would work, get a couple of german shepards...hey..hold up a minute, how would dogs get worked into all this? would the SOF just coincidentally have guard dogs on board? i don't think so...

maybe dogs aren't the answer to this question...

Well, the URF could use guard dogs, but they would be sentry units.

If we do get Flood in the game somehow, they could infect flying creatures and use them as spies. But for the Covies and the UNSC, they should stick to using satellites and orbital platforms for spying.