OHMIGOSH - that's AWFUL! What kind of person would send a note like that? I'm so glad you reported them. I'm sure it was just a meltdown issue from the writer, but scary nonetheless. I run an animal charity (dog rescue) and we often have to deal with animal behaviour issues - I would strongly urge caution with citronella collars as they can make dogs panic. Imagine if you were scared and then something squirted in your face every time you expressed that fear. Wouldn't help! That said, a dog with separation anxiety wouldn't just bark at one time - it would be constant. Your dog is probably just bored at that time (how long is s/he left for?) or has heard something nearby (that's school finishing time after all). Please PM me if you need more help. And maybe a wire mail cage behind your letterbox?? xxx
Wearing orange coat. 3:50 pm. Looked scared. Several people out looking. Lost sight as S/he was too fast. Is this your dog?