Detecting whole gameobject, not just its collider

Hello. I have four legged player with small character controller. It doesn't envelope it completely so it can interact with other objects properly. I am using a raycast to detect if the mouse is over it, but it only looks at its collider.

I am trying to groom it with different objects (icons like brushes that follow the mouse). I want the ray cast to look at its whole mesh though if it is possible?

pet = GameObject.Find("Pet");

mousex = Input.mousePosition.x;
mousey = Input.mousePosition.y;

GUI.Label (Rect(mousex,Screen.height - mousey,50,50), item);

var ray = Camera.main.ScreenPointToRay (Input.mousePosition);

var hit : RaycastHit; if(Physics.Raycast(ray,hit, Mathf.Infinity))

if(hit.collider.gameObject.tag == "Pet"){

pet.animation.Play("groom");

Thanks