Feck it. Get the dog checked out, if it is deaf then you need to decide what your going to do.
If you keep it and decide to run it then you will
Need to work hard to get a bond with the dog and work
Out an understanding. A shock collar has a vibrate mode on it do could use that to work out the recall.
I'm sure a deaf dog would compensate by using other senses similar to a deaf person.
I've got a 14 month whippet, she broke both her back legs at a young age and most said she wouldn't run again. Now she's keen as they come, catching and enjoying every minute of it. She sees the fer