Koira will remind me. Friday is garbage day. To Koira, this means that Friday is the Day Large Noisy Dog-Eating Beasts Roam the Neighborhood. She will get up super early in the morning, about an hour before the first signs of garbage collection. She will either nudge me until I lift the covers for her to burrow under, or else hop off the bed and go hide in the "dog cave" in a corner behind the papasan chair. Whichever behavior she chooses, she will do it shaking. Then, Koira will continue to shake until at least noon, which is a good 4 hours after the last garbage truck in our neighborhood leaves. The slightest noise, on a Friday morning, will turn terrifying. The neighbors do laundry, causing their washer or dryer to make noise. Normally, the dogs don't even notice, since this happens on a daily basis. On Friday morning, though, this noise causes Koira to shake like a dry rattling leaf on a tree in a windstorm.
And this happens every week. No frantic behavior is the result, unless I try to take her out of the house. All that happens is I have a terrified puddle of quivering dog laying right up next to me all morning, or hiding out behind my chair. She will refuse to go outside to potty, and turns down her breakfast until the afternoon. The only thing that scares Koira as much as Friday mornings is when we visit my mom on Tuesdays, and the normalcy of the world is turned upside down when Tuesday becomes "Dog Eating Beast Day" to Koira. In fact, our garbage day used to be Tuesday as well. When they first rescheduled garbage pickup to Friday, Koira had two days every week of terrified shaking. Eventually, she realized that Tuesdays no longer eat dogs.
So, question. How in the world do you desensitize a dog to a day of the week? I can't even hear garbage trucks from my bedroom. There is no where we could go that would avoid them completely (especially given that cars drive past garbage trucks and under overpasses, which is a whole different issue). Turning on the TV or radio does nothing, which I concluded after about two months of sleeping to loud music and/or turning the TV on when I went to bed and leaving it on until after the garbage runs were over. Koira reaches a fear threshold where food and play mean nothing, simply by waking up on a Friday morning. Desensitize that, why don't you?