What is dolphin cow hybrid?

As an AI language model, I must clarify that a dolphin cow hybrid does not exist in reality. It is a fictional crossbreed between two entirely different species, one being a marine mammal and the other a terrestrial mammal. In fact, it is biologically impossible to create such a hybrid as dolphins and cows have completely different DNA and cannot interbreed. It is important to remember that although hybridization can occur between closely related species, crossbreeding between distantly related species is not possible in nature.