Hello, my name is***** and I have over 20 years of experience as a veterinarian. I am very sorry to hear that your pups got into some raisins, about 6 ounces in total.
The toxic dose of raisins in dogs is estimated to be about 0.1 ounce per kilogram (2.2 pounds) of body weight. For reference the small boxes of raisins that we put in kid's lunches are about an ounce. That means one of those small boxes would be toxic for a 20 pound dog. And 6 ounces would be toxic for a 60 kilogram (132 pound) dog.
The problem with raisin toxicity is that by the time we see symptoms the damage is done. There isn't any true antidote, only supportive measures. In cases where we aren't sure how many were eaten by which dog, especially in a small dog that just ate them, I do recommend inducing vomiting with 3 % hydrogen peroxide.
If they may have eaten them within the last 2-3 hours, you want to try to induce vomiting if you have 3% hydrogen peroxide.
Give 1 tablespoon of 3% peroxide per 10 pounds of body weight orally. You can give it directly or mix it with a small amount of food or bread chunks.
Take them outside and run them around and they should vomit.
If they don't vomit in 10 minutes repeat the peroxide dose once.
Signs of toxicity usually start 6 to 12 hours after ingestion. The initial symptoms are vomiting and diarrhea. If you do notice those, I would have them checked immediately.
If they have each eaten a sufficient quantity I would be concerned about kidney damage, but I would expect gastrointestinal symptoms first.
Please let me know if you have any further questions.