Brian, you could consider going to my competitor Easy Green, they make an auto watering unit for about $500. It’s good but I can’t support you on it. The only automatic watering system I have is the Freshlife 2000 Sprouter. However the yield would be smaller than my 3 tray Wheatgrass Grower. If you wanted to use the my Wheatgrass Grower, you could start the process as soon as you return from your trip. The most critical period for growing Wheatgrass is the first 7 days. You would need to stay around for this critical period, however you can experiment with the timing once you have grown a successful crop.
Freshlife Automatic Sprouter with Wheatgrass
Sproutman SproutLab 
Is it okay to give my dog fresh wheatgrass that is raw… i mean not juiced?
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Absolutely yes! Or juice it and give him the wet pulp or add some juice back into the pulp.
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