Puppies are excitable, lovable hooligans. They have bursts of unbelievable energy, however in order to grow they need lots of sleep. New puppies need a room where they can rest and sleep and the other dogs in the house need respite. Older dogs don’t want puppies biting their ears and chewing their necks. How would you cope with an unruly toddler twenty four hours a day? Would you be annoyed if you had a toddler thrust upon you who pulled your hair and poked your eyes? I am sure that you would grumble.
Please don’t expect your dog to cope with an unruly puppy and to baby-sit twenty four hours a day. Supervise them for SHORT play sessions, then put your puppy in a quiet place to rest. (DON’T PUT THE OLDER DOG OUT, YOU MUST MAKE IT FEEL SPECIAL) I am not a big fan of crates, however if you do not have a utility room or a separate place where you can leave the puppy, a crate might be an alternative. Don’t expect your older dog to want to sleep with your puppy or to play with it constantly.
Your puppy will possibly need about four meals a day. Divide your other dog’s rations into four and feed it at the same time. At the outset you must ensure that your puppy cannot steal the food from your other dogs. Perhaps you can put the puppy on a lead, or create enough space to ensure that the puppy does not steal. However it is important that your other dog, or dogs knows that the puppy is not getting preferential treatment and that they are all being fed when the puppy is fed.
Give your existing dog or dogs extra attention when the puppy is resting and make them feel special.
There will be visitors, who want to see your puppy. If the doorbells rings when your puppy is with your other dogs, put your puppy into another room and tell your visitors to fuss your adult dog or dogs and provide treats for your visitors to give them, BEFORE the puppy is allowed out to greet your visitors.
Older dogs love puppies, with the proviso that YOU stop the puppy from being a pain in the bum. They don’t want a puppy being thrust upon them all of the time. If you do this any dog will object and be confused.
There are people on this site who will tell you to let them sort themselves out. If you leave them to do this, they will probably have fights when the puppy matures.