Oh wow, I don't know why I didn't think to look on the bag.
I figured I would have to go to the store to look at it because I thought my hubby used it all on the lawn but he told me he only used part of it. So I called the phone number on the
Bonus S Southern Weed & Feed and first asked how long it feeds the yard and they said 6-8 weeks. When I explained why I was asking, the customer service rep didn't say anything.
So then I called back later to ask how long the weed killer is active and got a really helpful guy who said he used to have guinea pigs himself. The ingredient to be concerned about is ATRAZINE and it has a half life of 12 days. It's still found in the soil 30-40 days after application with normal rainfall. After 60 days it is no longer detectable in the soil. However, he checked on what's called "grazer animals re-entry" and said if you're going to turn a grazer animal loose on the grass you should wait one year! They actually don't do animal testing so the 1 year is probably just to cover their butts legally. He said I should check with my vet to be sure what's safe. That's my next step because I'm still confused about what to do. I don't turn the piggies loose on the lawn (so they're not nibbling at ground level and pulling up roots and soil like a horse, cow, etc. would do while grazing in a pasture) ... I've always just cut the blades of grass with scissors. I hope to get a vet answer tomorrow, but I'm interested in what you guys think too.