A squirrels diet consists of nuts, seeds, and fruit. It'll eat bird eggs, bugs,..... even an animal carcass if there is no other food source available. As for an "average" dog's compared to a squirrel's brain? An average chihuahua has the size of an average squirrel's brain...approx Squirrel brain length=3cm
approx brain weight=6g
A bull mastiff has a bigger brain than a chihuahua, as for intelligence?? Jury out....
Behavior studies and not brain size determines the intelligence of a creature-Bet 10 bucks the dogs smarter (way smarter) than the squirrel.

This guy is hungry or inebriated on scent-oh and, not love, squirrels live alone, fuck everything and anything they can....sometimes they nest together when it's witch-titty cold, otherwise, they are a solo act.

This concludes your squirrel lesson for the day.

It's easy. God is like a animal behavior scientist. He's got some mice in a big maze, and he's standing there watching them with his big clipboard taking notes.

(Let's forget about reincarnation, heaven, hell, and death for simplicity)

Ok, certain mice find a piece of cheese and either eat it or not. Maybe the scientist is keeping notes and says, "Mouse #32241 did not eat the Stilton". One day the scientist is going to come and collect all the mice that did (or did not) eat cheese based on whatever experiment the scientist happens to be conducting.

Could the scientist intervene if there was a homicidal mouse biting the necks and killing all the test subjects? Probably. Would the destroy his mouse test protocol, maybe. Depends on what kind of behavioral study is going on.

And such is God and human "free will". This analogy I think is the closest I can come to JudeoChristian God relationship to humans living on Earth. Do the humans know what will and won't get you into heaven? Nope, completely arbitrary. Depends on which divinely inspired book you read, and in what century you happen to read it, and which Pope happens to be around.