Horse hooves should be kept protected, and checked regularly. Since it takes more energy in the winter to keep the body temperature regulated it is sometimes necessary to increase the calories or food quantity of those pets. This is especially true for pets that are very active or that remain outside throughout the cold weather. Notice if your pet is dropping or gaining weight and always consult with your Veterinarian regarding these things. Provide plenty of fresh water and make sure you check the water supply.
Pipes can freeze just as water-bowls can.
There are some special bowls on the market that keep ice from building up in the bowls and heat tape can help with frozen pipes. Wind chill will freeze your animal to the bone and carbon monoxide could kill your pet very swiftly. Also, take care not to leave any anti-freeze out. Be aware that anti-freeze can collect on driveways and roads, and is highly poisonous. Be very careful when using additional heat sources.