[Ashley V]

I don't think there is a time of day that is best in particular, but I wouldn't train while your dog is hyper or playful. I'd do it while he/she is more calm and focused and only do it for short time spans so you don't over do it. When training if you can see your dog becoming too bored or unfocused, it might be good to give it a rest for a little bit, but only end on a good note and don't forget lots of treats for him doing what you want!