This one may help. I have no idea if it still works though. It does have a modifier, but only for changing to a new sheep target before your current one is dead according to the description.
Source:
http://www.wowwiki.com/Useful_macros_for_mages
Sheep Focus
Using focus to keep an eye on your sheep can make you more reliable cc while also maximizing your DPS during the sheep's lifespan. The following macro gives you a single button that automatically manages your sheep as a focus until it dies or until you manually replace it with your current target.
When you click, if you're not already watching a sheep, your current target is put in focus and Polymorphed. Any subsequent clicks will resheep your focus, leaving you free to target something else for damage. Once your sheep is killed, click again to set your current target as focus and sheep it.
If you need to sheep a different target before your current sheep is down, target the new sheep, hold shift and click to make the change.
#showtooltip [target=focus,harm] [] Polymorph
/stopcasting
/clearfocus [modifier:shift][target=focus,dead][target=focus,noexists]
/focus [target=focus,noexists]
/cast [target=focus] Polymorph
Note that using this macro will interrupt any cast in progress and immediately focus and Polymorph.
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