This article discusses a measurement of deterioration of old books and historical documents that is based on the smell of the materials.Borchardt, John KWriter
Always have a microfiber towel or something similar with you so that your dog can use it as a carpet. It takes up very little space in the backpack, but, when you stop, it allows you to delimit a space for him like his carpet or bed at home. Most dogs will appreciate it very muc...