We have had a problem with toys that have button batteries in them. I just throw them away. We are lucky that our volunteers are pretty on top of putting balls away, but it's sometimes hard to find them all in the grass. I try to keep the orange rubber ones and not the regular tennis balls, but of course, that's not 100%. Other than that, we have the signage for dogs that might swallow a ball or ingest toys, so if we take them out, we walk them around the area to see if they find any toys before letting them off leash. Sorry I can't be more help!
------------------------------
Stephanie Lenny
Behavioral Coordinator
Brown County Human Society
IN
------------------------------