The most important part of doing agility with your dog is not to force it to do the equipment. It has to make up it's mind to do it.

With the teeter, quite often it isn't the height but the noise. What we've recently started doing with training dogs to do the teeter in classes is to get the dog to put it's to front paws on the end of the teeter that's in the air and letting them push it down. When the teeter bangs give the dog a treat and praise them so they start to associate the noise with something good. Also when first starting with the teeter don't let the dog tip it on it's own, tip it for very slowly and gentle till the dog figures out that it moves.

For the bridge or dog walk as it's also called, try having the dog start on the downside contact, and walk them down holding on to their collar, but let them decide how fast they move. Each time they go over it move them slowly up the downside so they have more distance to walk. After the downside move them to the middle of the dog walk and walk with them from there. Then move from the middle of the walk to the start. If the dog is out of control stop and make them wait and as soon as they calm down move forward again. Remember though it is very important that a different command is given for the teeter and the bridge, it will eventually help the dog distinguish between the two.

One other thing that is useful for contact equipment such as bridges and a-frames is to teach the dog to stop on the bottom with two paws on and two paws off. Just use a target with the dog at the bottom of the contact zone making sure that the dog has it's back two paws still on the equipment and give it a command, if the dog runs all the way off place it's back two paws back on the contact.

The Tunnel is easy, just start with it compacted together, get someone to hold the dog at one end you go to the other and call it through. Each time through the tunnel make it a little longer, when the tunnel is at it's full length try putting little bends in it. By that time you should be able to run with your dog beside the tunnel, but you still might want to make sure that there is someone guarding the other end so they can't pop out the end you sent them in and try to go around it.

As for the building problem it does take dogs a certain amount of time to get used to running in certain types of ground and envronment. Just keep it positive when you go to the building.

and finally a rule to remember, when the handler stops the dog stops in other words the handler sets the pace not the other way around.

Hope this helps.