We got a new fur-kid in the house! (need some suggestions!)

 Mouthing is normal. Try re-directing him on to a proper chew toy after yelping when he bites. Praise for good chewing behavior. As for Kenny, if the puppy doesn't listen to Kenny's warning, step in. But allow Kenny to say no, if Houston doesn't listen, remove him. Right now you're in the honeymoon period and he's had a tough time to start with. Take things slow and beware of the laser pointer. It could cause OCD.

Just saying "owwww" does nothing. You literally have to say it like it HURTS. It doesn't need to be prolonged -- just a heart-felt "OUCH" is fine. Mouthing is normal -- and he's never had proper boundaries before. Honestly I wouldn't use bitter apple. You may need that at some time for a specific thing and you don't want him to identify the bitter apple with YOU. When he puts his mouth on your hands just plain say 'No!" remove your hand and turn away. But like she says, the immediately try to engage him elsewhere and divert him. Yes let Kenny handle it -- but also don't set Kenny up!! In other words -- when you come in greet Kenny first, then Houston. Let Kenny be "first" -- it's awfully easy with a new dog to forget the older one and give the newbie all the attention (and yes, a lot of it may be negative and trying to distract him). The other thing you can do is use Kenny as a role model. The **instant** Kenny lies down say "GOOD lie down, Kenny!!" -- get other resident humans to do the same thing. In fact, if you can watch Kenny -- just before he DOES lie down say "Lie down, Kenny -- GOOD BOY!" In other words invent situations where Kenny does something and praise Kenny for it. It may be so automatic -- like responding to "come" or his name -- but show Houston that Kenny does it right. It will help.

Depending on the dog, yelping when they bite at your hands, may or may not be effective.  I've found it's going to be most effective with a young pup and not very effective with an older pup.  The instant a dog touches my skin with their teeth I stop interacting and walk away.  I don't punish or say anything. Negative attention is still attention so saying No or squirting with water is not usually effective as you may have discovered. Everyone in the house has to do the same thing or it won't work and it won't happen overnight. 

Yep, put the youngster up when he's harassing the resident dog.

When a dog is displaying "inappropriate" behavior remember that it's usually not inappropriate in the dog's mind.  Teach a default behavior such as sit or look at me and teach it so thoroughly that no matter what the dog is doing when you tell him to sit or to look at you, he stops whatever else he's doing and offers the behavior.  The only fair way to train a dog is to teach first.  You wouldn't want to be punished if you did something wrong when you hadn't been taught the right way to behave. :)

You might look at kikopup's youtube channel for some great training videos and advice.

 

 Unless Kenny is ill, I'd just let him teach the puppy his doggie manners.

See if there is a puppy / doggie play group in your area.  Other dogs are going to teach Houston doggie manners more quickly and effectively than you or I ever can.  As a 10 month old, he can be in with other pups and this will help him (and Kenny!) alot.

The place I go to for Agility and obedience classes has play times on Saturday mornings.  It is $8 for one dog for one hour.  They have 3groups: under 6 months, over 6 months (THE PLAYERS!), and small dogs.  Some of my rescues have attended a few times just to get them socialized, or teach bite inhibition, etc.  I am a huge proponent of this sort of training. You are busy learning to communicate with a dog, a new member of the family, learning his specific body language etc.  And from the sounds of it, Houston has not spent much time learning to communicate with humans.  Other dogs will be able to key in on his body language intuitively, and he will be in with the proper size and / or age so the training happens lots faster.