dog recall

[denzilpc]

looking for advice on getting our puppy a German shepherd (20 weeks old) to come back when called ! at home he will not leave my other half's side but let him off the lead outside and he will wander off or just sit down and watch her when called she has tried using high quality treats , walking away , ect but he will not come when called any advice would be most welcome .

[denzilpc]

he will retrieve indoors but again outside he will get to the ball and just lay down with it and watch her with a smug grin on his face !

[denzilpc]

hi we are currently taking him to training classes and using liver/chicken /sausages as treats ! think we will use a long lead as suggested.
thanks for the input.