Maybe keep them off the lawn till it dissolves??

Yes, dirtslinger, the obvious thing to do now would be to keep them away from it.

I was wondering if anyone else had experienced this or a similar situation with their animals ingesting natural/organic 'fertilizer', whether it be packaged or aged manure.

Thanks!!!

My cat drank some liquid kelp solution, but it had no bad effect on him. All it had in it was liquid kelp and water, though.

Plant-Tone has these ingrediants, "Derived from: Dehydrated Manure, Feather Meal, Crab Meal, Cocoa Meal, Corn Gluten, Bone Meal, Dried Blood, Sunflower Meal,
Kelp Meal, Alfalfa Meal, GreenSand, Rock Phosphate, Sulfate of Potash, Sulfate of Potash Magnesia, and Humates." Some dogs will have a violent reaction to Cocoa meal (as yours did), some will die after ingesting a small quantity. Some of the materials used are attractive to dogs (they are also included in many dog foods) and some others can cause digestive upset when ingested. If you use these kinds of products you need to keep your pets from getting into the garden, but the best way to prevent you dogs getting in this stuff is to not use it. Make compost and spread that instead.

Thanks everyone! The danger has passed and my pups are well. I will be more careful in the future. I have a great supply of natural compost that I primarily use. I just saw the stuff and figured I'd try it. Big mistake.

My dogs will eat about anything. They ate the Alpaca poo I put around my trees in the backyard. If given the chance, they'll eat from the compost pile. They'll eat the veggies out of the garden. They'll pluck raspberries off the bushes. One will steal your steak OR your salad whichever one you've turned your back on. She stole 2 cucumbers off the kitchen counter not long ago. Heck, one of them stole a box of kleenex out of the closet the other day, I guess it was to top off the roll of toilet paper he chewed up. I think perhaps one of them ate some of the onions I had drying last week (they were moved off the counter, and we forgot to put them back up). Onions are bad too. Ask my dining room carpet...
I've learned one should never assume the dog WON'T eat it... (ok, this makes my dogs sound terrible, they're really not bad dogs...usually...though the kennels just might have to make a re-appearance at my house if my boy doesn't reform a bit)