If your dog didn't read the chapter in the book that "all dogs love crates because they are den animals," this great instruction from the late Dr. Sophia Yin is for you! Some dogs cannot handle being left alone or isolated in any way. Safe confinement is used when you cannot supervise, not as a punishment! A crate is not the only way.
The real story.
Read this page and follow the guidelines in the green box to the right. This is how you "vaccinate" a puppy against future social problems.
Do not skip this: it is time-sensitive!
These are developmental milestones for your puppy, just like you've read about for your human child. However, dogs' developmental periods are measured in weeks rather than months and years. They still have sensitive periods that we need to know about in order to prevent future behavior problems.
Quick tips for your puppy!
This timeless book by Dr. Ian Dunbar can be downloaded free as a .pdf for free by signing up at DogStarDaily. You can read it from the website under "Raising a Puppy," downloading it from Kindle, or buying a hard copy. This is the most comprehensive, easy-to-digest guide to raising a puppy available.