If this forum is anything like the several different forums I'm a member of then I know I'm gonna get blasted for posting without searching first.
However I did look here and online, and non of the posted solutions and suggestions worked for me.
I got Seayl about a year ago and she's about 2 now, she was abused and neglected before, not sure what really happened but I can tell, she has done great with me as far as learning commands and few tricks here and there, but the only one she refuses to do is fetching.
I've read about trying with their favorite toy first but she doesn't really have one, there are several toys for her but she doesn't care for them, she doesn't even put things in her mouth, and that's the biggest problem for me.
In the beginning she started playing fetch and she would get the ball and bring it and it was going good, she just didn't want to do it for long periods of time, then suddenly she just stopped. I even started with her from scratch trying to get her to hold the ball in her mouth, but like i said she wouldn't even open her mouth. She wouldn't even take treats if she knows it's associated with playing ball now. she just refuses to open her mouth.
I tried giving it break and then coming back to it couple of days later but nothing works.
She's very smart and good to train, so I know it's not a fact of her not knowing what I"m wanting her to do, I tried to open her mouth and give her the ball that way and praise her for holding it but she would drop the ball imminently.
There are couple of dog parks around us and she goes there several times a week, and I take her running on the bike once a day, so she gets her exercise that way but I would love if I can get her to play fetch. She's very energetic dog and it seemed like she liked in the beginning, and i'm sure if she starts playing she would love it.