Morkus from Orkus
So separate perceptions. The pet is watching in one direction and you the other. There's no direct help for the PC happening there.I can see a bunch of ways it might make sense. "Back to back, old girl. I'll watch this side of the camp and you watch that side."
So her scent ability allows HER to pick it up and you're oblivious until your perception kicks in. Again, that's separate perceptions. You still have no direct help to your perception.or "She can pick up scents on the wind better than I can, so I focus on distance and color."
That can't happen with perception, other than to cover more directions individually or options individually, like you describe above.Two beings cooperating in a way that is greater than the sum of their parts.
It at least has magic to make YOU more perceptive. The shield isn't doing its own perceiving like the pet you describe above.