When I first decided I wanted Elli to be a bikejoring dog, I realized I would need to get her into yet another harness. Elli doesn't like any of her harnesses because I often put her into them without any prior desensitization. This one, I decided, would be different -- I need her to work happily and that means getting into the harness happily.
If you're a visual learner, here ya go:
We'll be using targeting to help the dog into the harness.
Prerequisites: Dog must know how to target your hand/fingers/an object for a C/T.
Dog must be accustomed to clicker, but you can also verbally mark ("Yes!").
Putting on the Harness
Step 1: Start by holding the harness in your hand and cuing your dog to touch it, C/T.
Move it around a little in your hand, so that the dog is touching different parts of the harness and begins to learn that this harness-thing is pretty cool -- it dispenses treats!
Step 2: Fold the harness up so that only the neck-hole is visible to your dog. Put your arm through and ask the dog to touch your hand (if you're using an object, hold the target in this hand). Start so that it's very easy for the dog to reach the target and as he succeeds, reel your arm back further and further, so that the dog must move his head forward into the harness' neck-hole in order to touch the target. Continue to C/T successful touches.
Step 3: Hold the target (or your hand) just outside of the neck-hole, cue the touch. If he gets scared when his head touches the neck-hole, go back to holding the target just inside of the neck-hole. Quickly increase criteria to outside the neck-hole.
Step 4: Your dog might be touching the target and then moving his head back out of the neck-hole as quickly as possible, anticipating his C/T. What you'll have to do now is start pulling the neck-hole around his head -- C/T as you do this and when you deliver the reward, take the harness off! Taking the harness off is just as reinforcing as the C/T is!
Step 5: After your dog is comfortable having the harness around his neck, C/T for wearing the harness. You'll be keeping the harness on this time. Reward several times for touches while he is wearing the harness.
Step 6: With the harness around his neck, C/T for touching one front foot. Do this three or four times and then begin to hold the foot in your hand, C/T for this several times. Pick the foot up, bend at the ankle, C/T several repetitions. Finally, pick the foot up, bend it at the ankle and slide it into the leg loop. Repeat with the other front foot.
Step 7: Your dog should be in the harness by now, so we'll C/T for easy things to help him understand this harness is not a punisher or restriction device. C/T several easy nose-touches to the target. Ask for his favorite tricks in the harness. Elli's include High Fives and Spins. This will build his confidence in the harness. He'll learn he's still allowed to move in the harness.
You might also consider a fun game in the harness, fetch or tug come to mind. But don't carry on with this for too long as we need the dog to understand that when he has the harness on, work is going to happen, not play. When we finally get to pulling the bike, running will be reinforcing enough.
Taking Off the Harness
Just as important as getting the harness on is taking it off. We don't want the animal struggling to get the harness off -- it should be an easy affair for both human and animal.
Step 8: Start by picking up each foot and bending at the ankle, slide it back out of the leg loop and C/T. We're C/Ting for the whole process this time, as we've already desensitized the foot-pickup. Repeat with the second foot.
Step 9: Elli was timid about this next part, so I started by just moving my hands around the neck loop and C/Ting for having my hands near her face and gripping the neck-loop. You can begin pulling the neck-loop over the head now, C/T
as you do this, and reward with the harness fully off. Repeat the putting-on process with the neck-loop, C/T the process again if you must and then repeat the taking-off process.
You should repeat this process a time or two each time you want to work your dog in the harness, but you'll be able to move through each step more quickly. Eventually you won't have to C/T every step, but you'll be able to put the neck loop on, C/T, pick up one foot and put it in the loop, pick up the other foot and C/T for both feet being put in and the harness being fully on.
UPDATE: Elli is not a large enough dog to pull a bike, so I'm considering an off-road scooter or rollerblades. If neither of those works out as planned, off-leash biking is always an option that I think she'd welcome.