Dolly wheel bearings leaking??

Effy wrote:
Mine does not have brakes

Hopefully no one will notice you said that LOL. Are you sure they are grease filled and not oil filled. From this arm chair observation point, grease usually does not run. My rear hubs are oil filled. One started leaking, so I pulled it off in a Walmart parking lot and packed it with grease. That was a few thousand miles ago and it has never leaked since. Unless the hub is getting hot - possibly from being too tight, it would be a surprise to see grease run out. On my boat trailer, the grease is open the the air and doesn't run. Its possible to just be a bad seal, but it just really seams like there is more going on.