Anyone have tips for training a dog?  

you need to get the book and or video of that lady dog trainer that has a TV show, that woman is amazing, she thinks like the dogs and makes her training dogs look so simple and a friend of mine used some of her tactics and it worked for her...

A trainer once told me to fill a spray bottle with vinegar and water. Every time the dog jumps spray it in the face(not the eyes), push it down, and say very stern and load a one or two word command like down or no jump. It worked with my sons dog.

It sounds like redkathy has some very good advice for you. If it doesnt work you can always consult with a professional trainer. Having a young dog and a young child is probably kind of a hard combination but I'm sure it can be managed with some help.
Good Luck hope everything goes well with your son and your dog.

Animals needs short repeated direct commands in order to understand. If you sound short, to the point, like 'no' and 'down' when he does it, then he will get the message. You have to be persistent, patient, direct, for him to respect and understand the training. It is very common for dogs jump on people. It is also important for your toddler to not be afraid when a dog is not being mean or aggressive. The child should know the dog is just being too friendly, and then learn to tell him to say 'no' in a nice, but direct way, when the dog jumps up like that. The dog will then learn to respect the child one on one too. All will be okay with persistence and patience.

My cat knows not to sleep on my clothes, or get up on counter tops, tables, or anything else for that matter. She has to stay on the floor area and she is okay. She is not abused or anything. She just does not do those things or else is simply told a direct short 'no' when she does, and then she lays on her own bedding or the floor. Animals learn with repetition and respect you more knowing what to do and what not to do. Your dog and child have to build a respectful relationship in the family, with your guidance of course, and then your dog will be there as the child's friend. I loved growing up with a dog, and your child will develop many happy memories too, I'm sure. Good luck. Laura

He's a puppy, puppies jump. You have to train him to not do it. lilaclady gave good advice on that trainer, she's a really good one so get a book or video, learn as much as you can and choose a method and stick to it. You have to do the same thing every single time, otherwise it's too confusing. Dogs don't understand why jumping (or any other behaviour) is allowed one time and not allowed the next. If you don't take the time to train him out of the jumping, then you should consider rehoming him so he can be an inside dog. Cocker spaniels are NOT intended to be left outside on their own.