Well I avoid at the moment, normal lawn type grass areas are fine like playing fields, country park fields etc, its the long grassy fields which are a problem and where you get those horrible sticky dart things. I would rather prevent than end up with Indie having an operation but thats just me. Some areas are hard to avoid but depends where you live.
Where I live I can just go on open playing fields so its not a problem but I try to avoid the areas at the end which are really long grass and have the dart type and call her away if she tries to go in there.
If you can't help but avoid those areas then keep checking him all over, I still check Indie when I come back from a walk and she still has things caught up in her.