f**k all the squeaky toy bollox , get one of these and be done with it .
http://www.ebay.co.u...=item4cf9eeadb7
nice and gently depending on how far away they are , 2 second bursts for 10 seconds at a time but this could be different everytime , you will learn to start and stop squealing by looking at the foxes actions.
i dont rate the bar which you bite down on, ok for getting the attention of a long fox then i swop to the brass disc. failing that use the back of you hand