a whisstle is very good to use for recall as it shows no emotion, as your voice may,ie come here! said loudly will make the dog think your angry and he wont want to come,just always praise him and make it enjoyable for him to come too you,never be angry when he comes back too you no matter how long it takes him,and also dont repeat your command,enforce it or if hes taking the pi** walk away he should follow ,then praise, my first lurcher is now 12months old and shes coming along lovely its great when they click with ya,
hope this helps.