My DD - who is 4 - really wants a puppy. Me and DH are not opposed to a new dog but we're not ready quite yet so we're taking this opportunity to teach her the value of "earning" something she really wants. Up to this point she hasn't had that lesson - but then I think she is really getting to the age that the idea would work and "stick" with her about achieving things with hard work. So what do we have her do (chores, behavior, etc) and what value do we assign to it?? So far I have allowed her to use 1/2 her piggy bank money (I just took it to the bank today) and for helping her daddy clean her fish tank I gave her $5 (that is a high dollar job - I want most to be around a $1 or even $0.50.) I made her a chart that we would color in each dollar as she gets there. She has to earn $200 before we can start shopping for a dog and I expect that to be about 1/2 and if we luck out and find what we are looking for for less or free (which I would love) then we'll use the money she has earned for pet care. This is going to be her dog.....I want her to be responsible for feeding, walking, etc (with help as necessary). We would like for it to take her until her birthday (November) to earn enough. The main things we are working on with her behavior-wise is listening and sleeping all night by herself in her own bed. So I'd love to hear some suggestions on making this a really positive experience for us all.
. My DD can make her bed (it's a queen size but she does remarkably well with it) so that is on her chore chart. We also put things on there that she struggles with: going to bed w/o and argument, getting dressed by herself (she is really lazy around this and always wants us to "help"), brushing her own hair, and picking up toys w/o being asked. She also has to clear the dishes after dinner. Sorry I can't help more...we just haven't found a lot of chores that she is capable of doing. Good Luck!!!
I'd go more for the random reward when the child does something to help when you didn't even have to ask. Spontaneous giving after the fact is a reward and positive reinforcement, negotiating a fee prior is bribing. 

We weren't expecting him to be so big, but he really doesn't take up a lot of space. He looks very poodley and doesn't shed. He definitely has a standard poodle personality, very loyal, distinguished, smart, and appropriately energetic. Yet he is content to lay around in the house wherever he finds a sunbeam.
)- I took my dog to the classes at my local Petsmart...they were great (and very cheap), and the trainers always encouraged us to bring anyone we would like to learn to train the dog (including small children). We got an 8 week class for around $100, and I saw a huge change in my dog's behavior. 