Sadly we see this often.
Pets, especially dogs, tied up outside
Some have a shelter but not much else.
One thing they need for sure is WATER!
NO! Snow is not good enough. It drops the body temp and it takes a lot to equal a good drink.
Food is also important so that the pet can generate body heat.
Feed you pet an extra meal, make sure it is warm and give it water that is also warm...NOT HOT!
Put yourself in your pets place... what do you think you would need?