At first, dogs & trees might not seem to have much in common, but actually, their bodies work in similar ways. Nearly everyone knows that trees lose their leaves in the autumn, & it might seem obvious that dogs shed in the spring & fall, but have you ever wondered why some dogs shed all year long? Also, wild animals only shed seasonally. The answer is that an outdoor dog – one who spends most of it’s days in the yard or some other place outdoors, will only shed in the spring & fall, while an indoor dog, one who spends it’s life inside, only going outdoors for walks, will probably shed all year round. This is directly related to the amount of sunlight the dog gets, i.e., how much of the change in the air surrounding the autumn & spring the dog experiences. This same thing happens to trees & bushes in the fall. If you look closely at a bush that has begun to change color, you will notice that the top leaves change first, & when leaves are over lapping, parts of the lower leaf that are under the other will not change until later in the fall.