I've checked a couple of websites and haven't found a definitive answer. Does anyone have experience using Roundup (dandelion weed killer)? Is it poisonous for pets?

We have made an offer on a new house. The back yard is absolutely covered in dandelions. We need to do something drastic (yet not harmful) to get rid of them and start the lawn all over.

Our kitties are allowed outside under our supervision and Bobcat plans to build them an enclosure so they have a part of the yard all to themselves. But, before we do anything, we need to make sure whatever we put on the lawn doesn't harm cats or dogs.

Thanks.