It does sound like a fun place for Cody. I have never used one, so can't really offer much advice on this. Maybe you could put him in there one day while you are at work, and watch him on the web cam (which is SOOO cool, by the way . . . send me the link if you do put him in there . . . I want to watch too!
) to see how he does? If you like your trainer, his/her recommendation is a big plus!
If Cody is anything like Jackie, he'll have no problems handling the big dogs. With my little tomboy, I worry more about her playing with the small dogs. She's so rough, I'm afraid she'll flatten them!