I assumed she meant the LIQUID goat wormer (which is just a higher concentration per ml than the dog - the active ingrediant is the same fenbendazole). I have used it for years. I also routinely treat all my dogs after hiking in the adirondacks as there is a high incidence of giardia in the mountains (darn beavers!)
The Safe Guard for goats is 100mg/ml the Safe Guard for dogs is a 2.5% solution which is 25mg/ml.
For what it's worth... goats are dosed at 5mg/kg so ten times less than the dosage that we treat our dogs with, so the chance of overdosing a large breed dog with safe guard paste for goats is pretty slim. Even the 25g Safe Guard for horses only contains 2.5 grams of fenbendazole in it, which isn't far off from the 2 grams that a 90 pound shepherd would require.
With all that said.. I don't use the paste and don't recommend the paste when the solution is much easier to dose. But I do use and would recommend others to use the high concentration solutions that are available for livestock over the cost prohibitive granuales available for dogs. Just becareful to dose your dog based on the 50mg/kg and not ml/pound... that's where the confusion for some lies.
My thoughts anyway :)