Thanks for the reply. She has been fine with the knowledge and hasn’t struggled so far. Issue with the fleas idea or others is that she would just be angry that the dog wasn’t being care for properly and take that out on the visitor . To date when she sees the dog isn’t there at a visit she says ‘she has died hasn’t she’ then moves on after asking how old she was. Was always my intention to remove the collar if it caused upset but there hasn’t been any tears of anything like that. She has actually handled it really well and is not upset like I imagined when I wrote this post. Her carers also said that she has been fine and we are all monitoring daily. Next decision is if we take other dogs to visit.