The only poisonous snake that is commonly found in the Atlanta area is the copperhead. The best way to educate yourself about the different types of snakes found in your yard is to get a local field guide. Snakes play an important role in the natural balance of even a small ecosystem like your yard. Without them, you would probably be overrun with small rodents. Learn to respect them, not fear them.
Raccoons are very opportunistic feeders.
They will eat almost anything that is available. This may include your pet's food. Raccoons should not be fed or allowed to eat your pet's food. They will come to depend upon that food for their source of nutrition. Their diet should come from natural foods that they can obtain from the habitat around them.