I am after some advice. We have had our fab Rommie rescue for 4 months now and all has been going swimmingly. She is 8 months old and training has been steady, we have been working on recall using a whistle and she comes running as I use cheese as a high value treat and she will do anything for a bit of cheddar. However, she has no idea about running after a ball and bringing it back. If we throw a ball or anything she watches and then sits and looks at us. Can I please have some tips on how to teach her to how to play fetch?