What are some cool dog tricks and how to teach them to my Pomeranian/Chuiaha?

for rollover you need to teach lie down first ... you do that sitting in front of the dog on the floor and with a small treat put in front of the dogs nose and slowly lower the treat to the ground moving away from the dogs a bit to give her room to lie down and giving the command ... when the dog has learned lie down, i started by rolling the dog over from a lay down position and then make a commotion like they did the best thing in the entire world and give a treat ... when she was used to me rolling her over and praising her and giving her treats, and using the command rollover, i started moving the treat in front of her when she was already lying down in a circular motion and saying rollover ... she learned it quite quickly ... the cookie on the nose is easy ... place it there and if the dog moves or tries to eat it very firmly say hey or leave it ... with some patience that is also easy to teach ... i also taught my dog to bring specific toys ... like if i tell her to go and get her hedgehog she is off to get the hedgehog ... she can bring 7 toys reliably by name ... i started with two toys and would say to the dog, where's piggly wiggly, bring it ... and if she brought the right toy she got a treat ... that is also pretty easy to teach ... good luck :O)