Interesting people mentioning using silicone to attach the anvil to the stand, but for a long time I have had trouble with my anvil stand wandering around in my garage, especially when working on the horn. I have about a 150 lb anvil, so it crept enough to have to move back once or twice during a forging session.
I have tried using rubber feet, widening the base, etc but it still moves. Don't want to drill into floor to fix it in place.
Using silicone between the stand and the cement floor has now secured it in place. Very well. No more wandering! Makes forging more enjoyable since I like the setup I have.
Of course the downside to this is that it is semi-permanently in place, so if you need to move your anvil in your garage from time to time, then this might not be the right solution for you.
I could send a picture of the stand, but it isn't anything really special. I got a few stumps thinking one of them would make a good anvil stand, but none of them were square enough to suit the task, let alone the right height.
It is actually very easy to make a stand out of 4x4s glued together, so I recommend that to people who don't have the tools and experience necessary to make a metal stand, or access to a big piece of wood/stump for a stand.