Not necessarily.It is not uncommon for puppies to do this. Dogs are pack animals, meaning they naturally hunt, eat, rest and sleep in packs. So when a puppy is left to sleep alone, they will get upset. This will occur for a few weeks after getting a new puppy until it learns to accept it. How long that takes depends on the puppy.
Giving the puppy a mate will likely help. You could also try leaving a cuddly toy or a warm clothing item that has your scent on it.
You need to train it. Try this link for help.
You can have a puppy when you are at least 6 or older. I guess...
If he's whining and hasn't moved for a while, I'd say he's stuck.
puppy
no
It is jealous of it and trying to hurt it. You have to very careful having them together if at all.
A puppy can get jealous of an older dog but dont worry there can be a way like make the puppy be happy with somthing and distract them by somthing that will make them happy and not the older dog jealous.
The best way to introduce a new puppy to an older house cat is to hold the cat while the puppy checks it out.
If its a girl puppy and she is 6 months or older she could be in her first heat.
It is probably trying to dominate. Because the puppy is younger, the older dog wants to show it that they, (the older one) are the boss.
If the older dog allows it - yes.
Less than 2 hours for a young puppy days for an older puppy.