Please help! So frustrated.

Don't shout at him, that will make things worse.

He is a puppy. But there is no law that you cannot use a leash in a house. Bring the puppy in on leash. Put a crate in the living room where people are settling down and have a big bone in there.

When he gets a little too rambunctious on lead with the other puppy put him in the crate and give him the large bone to work on, hopefully to stop him from whining and carrying on in there. At least he will be in the same room with everyone else.
After a while try again.

Also start classes, puppy classes if possible. Train him every day. Take him for a good walk, then play a chase or tug game in the yard for a while. Get him tired out. Then bring him into the living room. A tired puppy is a good puppy.

Terriers can be holy terrors and can be very full of energy and wanting to play too. The problem is, your dog at just over three months can actually hurt the other puppy, and it does not have to be deliberate. I think you should let them play together, but when your pup is tired, while you are supervising, and as soon as it gets rough, time out for one or the other.

If you have the room, put up a doggy play yard in the living room. Sometimes, the terrier and sometimes your pup is put in the play yard. Have toys and in there, and use it so that both dogs have some time to learn how to be free in the house without just play, play, playing.

Biting at this stage is playing, but that does not mean they cannot hurt one another, or that the play cannot get too rough.

Is the utility room door shut, or is it a baby gate. Shutting the door is so much more hard on a puppy than gating him away from the hubbub. He can still see and hear, and he is not isolated.

Get him in classes ASAP. Hope your roomie gets her pup in classes too. Little dogs need obedience classes too. But I would not suggest the same class unless that is the only way they will do it, and then try to work apart from one another.

Good luck.

I think a group of roommates all have a lot of growing up to do.

Too bad the puppies are in the middle of all of that.

The best advice I can offer is to call the breeder and ask if you can return the puppy.

If you do not have the money for training classes, how will you pay for an obstruction to be removed? Or, how will you pay for an orthopaedic surgery? Or, how will you pay for vaccinations?

In short, what were you thinking.

When you purchase a puppy, everyone in the household should be on board. This is not a situation were you live in a building and you have a bedroom, bath, kichenette, and living room. It sounds like you share living quarters. And somehow you are low man on the totem pole and your dog has to stay outside or banished to a utility room.

When you were considering this purchase, and they were considering theirs, did you get together and go over some house rules? ie, no dogs on couches, who cleans the poo in the yard, which dog is allowed where and when? What to do in the event the pups will not coexist in harmony?

Bringing a puppy into a household is not the same as buying a laptop or a bicycle. You need to be somewhat in agreement with your roommates about this. If you were, you could set up two crates in the living room, and crate both dogs when the play is too rough. You could set up an ex-pen or play yard and put one or the other dog in it. You could put a crate in your bedroom and let your dog sleep in the room with you.

This pup is going to be nothing but trouble if it remains outside of the household, isolated, alone.

The answer IS NOT a four mile walk every three days. In fact a walk that long should never be forced on a youngster like this.

Call the breeder and explain the situation, if they will not take the dog back (do not expect them to return your money) then you may consider asking a rescue to help you place the puppy in a good home. I do not think you have the time or money for this, and even if you do, the household people do not seem to be willing to allow it.