What I found more interesting than the SMS is the auto-release of a wolf-repelling chemical. The sheep gain a weapon of sorts, though not fired under conscious control. Sort of a cyborg-ish extension to the sheep's natural ability.
Sheep are a tremendous source of methane [1], I think we should patent a device which collects the methane and includes an ignition system that is triggered by metabolic symptoms of fear or distress. Combined with head tracking, the preferred embodiment would collect methane into a holding tank on the sheep's back. When the device detects sheep panic, it turns an exit nozzle for the tank toward the direction the sheep is looking, releases the stored methane while simultaneously applying an ignition source. This ignites the methane which converts it into heat, water, and CO2 which has a much lower impact on global warming. The resulting jet of fire not only discourages the wolf but through the effects of Newton's third law of motion causes the sheep to be rocketed away from the source of danger thus saving it from harm.
We will of course require new signage in the grazing area suggesting that people really really should not startle the sheep.
