If you have the window handle (hWnd) of that combobox, then you can use SendMessage API to do that.

Code:
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Const CB_SELECTSTRING = &H14D


'-------Use this on any event
    Call SendMessage(ComboboxHwnd, CB_SELECTSTRING, -1, ByVal "Dog")
------------------

Serge

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