Weird circumstances IMHO. You should, at the very least, be present.
Some trainers do take dogs in for "in kennel training" in which the dog lives on their property, they work with it several times a day, and then after x amount of time they train you to work with the dog. But I've never heard of one just picking it up and leaving for an hr, then returning. No, I wouldn't allow this.
In kennel training is different IMHO. The dog lives with the person or interacts with them multiple times a day. Many on this forum will tell you the dog may get trained, but will revert once back with you. this is not true, if you are with a qualified and professional trainer and dedicated to learning. It's easier to learn with a dog that already has a foundation laid than it is for two newbies (you and the dog) to go from A - Z. If the trainer teaches the dog the behaviors and commands, you simply need to learn proper implementation and corrections/rewards. Many dogs are pre-trained for someone who wouldn't be able to train the dog themselves, but can certainly learn to continue the training (such as service dogs, police dogs, etc).
Last edited by Rerun; 10-09-2010 at 07:55 AM.