As dee mac says will end in tears due to the terriers nature.I had a mate that used a russell for years and I always warned him but he said they are brought up together etc etc,then one day hawk nailed rabbit, terrier grabbed rabbit, hawk footed terrier then she retaliated and took back talon off hawk,hawk then rendered useless. As dee mac says use a gundog tried and tested over many years dog for job. I have used pointers and spaniels with great results,depends what type of hawk your flying.