So which part of the typical land shark behavior are you having issues with?
The crying part? Yeah, that’s because puppies have to relearn a whole new world that no longer has their mother or siblings. I’d probably cry too.
The biting? Imagine a human baby. How do they start learning about their environment? By putting everything in their mouths. Puppies don’t have hands, so they can’t pick things up to put in their mouths, so they can only use their mouths. German Shepherds are notorious for the behavior you are speaking of. That’s why the are called land sharks.
Is the puppy crated? If not, you are setting both dogs up for failure. The puppies teeth are sharp as razors, and can easily puncture your senior, causing her to snap at your pup, with a not so great ending. Even if that never happens, why torture your senior with a puppy that wants to go go go. A senior deserves space and rest.
The barking? That’s how they communicate. And if she’s barking at night, she either needs to go potty, or she isn’t feeling comfortable in her environment. If she left loose in the room with the senior, that could be a good reason.
I would recommend doing a lot of research on GSD puppies, and their normal behavior. Nothing you’ve explained seems to be out of the ordinary.
If she’s crying during a walk, are you dragging her? Or is she walking beside you? What are the temps in your area when you are walking her? She’s not crying because she likes to hear herself, she’s crying to communicate something to you.
Biting? Yep, get used to it. It is not abnormal for the breed at all. Have lots and lots of toys available, and when she gets bitey, redirect her with a toy, and give her verbal praise when she stops biting you and starts biting the toy.
What kind of training are you doing with her? Training is a great mental stimulater, and helps with the zoomies (running crazy circles everywhere like a nut job), and with that bitey part as well. A well stimulated and tired pup is a lot less motivated to bite.
If you don’t have a crate, buy one ASAP. Put the crate beside your bed at night. That often curtails the whining and barking at night, unless she needs a potty break. Some people put the crate on their beds if the whining and barking is still an issue, and slowly work towards getting it on the floor.
I have 3, a 9yr old, a 2yr old, and a 4 month old. They get limited time together, and that time is usually them all just napping near each other because I’ve tired them all out.
I train and work the two younger ones individually, it’s important that she gets one on one time with you. My senior gets less work and training, and more loves and cuddles because she doesn’t need as much stimulation.
Good luck, and enjoy your new lank shark puppy!