Как написать по английски какой размер лисы

What is the size of the fox? What is the foxs size? What is the girth of a fox? What size does a fox have? What proportions does the fox have?

какой what;

размер size, proportions (пропорции), girth (обхват), body (тело, туловище);

лиса fox, she-fox (лисица).