Dog excrement must also be collected in the mountains. Not only because of the unappetizing smell, but because dog excrement is not natural fertilizer. On the contrary, the parasite neospora caninum, which is excreted in the feces, can cause colic and even miscarriage in cattle and is also passed on via intermediate hosts such as sheep, horses or goats. "Dogbags" therefore also belong in the hiking backpack, and then back into the valley.
Free running dogs endanger many wild animals, in the pasture area also farm animals. "Whistling back" a dog whose hunting instinct is aroused by a scented wild animal can be difficult or impossible. It is not comparable to a situation in the park.
Cattle pastures pose a particular danger with dogs: Especially mother cows quickly perceive the dog as an enemy and then aggressively defend their calves. Therefore, avoid pastures with a leashed dog in a wide arc - if the cows become aggressive, let the dog run!
In Bavaria, leashes are compulsory only in nature reserves, but also in the great outdoors if, for example, the dog owner allows his dog to chase other animals. Good training and following the standard commands (sit, down, stop, off, heel) is a basic requirement for off-leash walking in the mountains.
Respect fellow humans who are afraid of doggos. Kynophobia is not an imagination, but a recognized anxiety disorder.
Basic fitness is not only needed by humans on the mountain, but also by dogs. So: first get to grips with it before you go on a big tour.
You can find more information on the page of the DAV.