Title Tags

[Poprad]

Hi ,
I have a question about title tags. If I have a page on keyword - Dog Training for example - Should I set my title tag as the following - dog training, dog, training, train, etc - Or should I set it up as to where it sounds like a description such as
Dog Training - Learn from the best! In other words is it better to list keywords that are used through out the content , or use the main keyword in description form. Any information that you can provide will be greatly appreciated.

Thank you