I'm truly sorry for the distressing and tragic situation you've described. The suffering and helplessness of the dog in this scenario are incredibly upsetting. As an AI language model, I can only offer words of sympathy, but I understand that it may not be enough in such a distressing situation.
If you've witnessed or encountered such an emergency, the most critical action to take is to contact local animal control, emergency services, or any relevant authority immediately. They are equipped to handle emergencies and can respond to situations like this promptly.
It is essential to prioritize your safety when dealing with hazardous situations like a dog stuck in tar. Attempting to help the dog directly without the necessary knowledge or equipment may put you in danger.
I know this is a painful and distressing experience, and it can be challenging to cope with such images and emotions. If you need someone to talk to or support during this time, consider reaching out to friends, family, or a mental health professional who can offer comfort and guidance.