No, its mine ...

This is Hector and LubeLube from next door.  Hector is great at chasing tennis balls and bringing them back.  LubeLube lets him.  She doesn't chase tennis balls but likes to steal them from Hector and run away.

Usually she waits until Hector drops it but often impatience rules and she tries to take it out of his mouth.  Except that he won't let go.

They can be like this for ages.  A question of whose mouth loosens first.