If you're going to give dogs +10 to Spot and Listen, you might as well give cats +15 to Spot and rule that they "take 10" on all attacks (pouncing). You could also rule that Lizards take extra subdual damage from cold (from the cold bloodedness, you know!), and get a +30 to hit bugs with their tongues.
That, and Spiders get a +26 to Hide in Leaves and Freak the Heck Out of the Missus.
Also, humans shuold be able to acquire a feat that lets them read the stars for astrological signs and gain 'hippie points' for hugging trees.
I mean, after all, if you're going to up the power of one critter just because it seems like they're a lot better than they actually are, you shuold probably be fair about it.
These 'sixth senses' that animals have are as far as I can tell no more than extremely developed normal senses. Yeah, the dog can hear your car, and knows your gait from someone else's, and can distinguish your smell. Kind of the same thing as that general feeling of 'what should I do?' when you walk into a friend's house for the first time, or a general feeling of putting on a show when company is over....it's fundamentally no different, and the game doesn't take it into account for ANYTHING, which is perfectly OK.
Basically, if you start saying "Dogs can sniff out cancer! They get a +10 to Spot!", you start kind of having to say "Bees can see in Ultraviolet! They get a +20 to see bright things!" or "Because snakes live in deserts, they get Fire Resistance 3!" or "Since bears can hibernate, they cannot be fatigued from starvation!", and "Wet things should take more electricity damage!" and "We need rules for how zebras confuse lions....they get a +5 hide vs. color-blind animals!"
It just gets really silly really quickly, and, I think, unnessecarily. Of course your dog can notice someone who's strange entering your house. So can you. Your dog just barks at it.
