Sometimes these dreams about Dead Pet can have important underlying meanings though which should not be discounted under any circumstances.
A pet is someone that is supposed to be there with you no matter what, someone that will love you unconditionally and that you too can love unconditionally as well. You are supposed to love them and they will love you while you provide for them. For a pet to die is like a partner dying. Thus if you have a dream about a dead pet or a dying pet it means that you feel as if one of your best friends is no longer in your life or will no longer be in your life anymore. This can be a really sad realization to come to, but it is one which you need to realize the significance of before it is too late. Try to reconnect with your friend if possible, before you lose something extremely important to you.