I think taking them a lot is the key. I used to take mine more and they definitely were better. If put a little vinegar in the Squirt Bottle of Doom ™ Baxter won't like it, even if he does like water. That was what the dog training facility did with the labs and other water dogs. I did it with Scooter and to this day he ducks when he sees the Squirt Bottle even though I haven't put vinegar in it in years.

I've thought of just putting the harnesses on mine and then not going anywhere, too. Just the sight of the harness puts them into a frenzy. Especially Cash.