Once your pet is epic, is that the end of its training? And whatever skills and talents it has at that point are all that it's ever going to have? (sorry if this is posted somewhere else..I did look!)
Yes. Pets recieve a total of 4 talents and 4 skills, the forth of which is recieved when the pet reaches Epic. Occasionally the pet may get a "talent" that increases its statistics (ie +25 to power) at Epic. In this case you could still train the pet to top off it's stats and it is possible that it's existing talents would benefit.