listen lads every dog has its limit i find a lot of lads wont let a dog heal up befor its next outing i owned a dog out of golly called jake and i be very onest he wouldnt do big bambi but anything eles he was great on but in all onesty he never had a lot of gears so mabe he go sick of chasing bambi but i believe that dogs are bred 4 surton things and 4 deer unles golly was put 2 a pure greyhound deer dogs they were surtonley not but that is only my opion from what ive seen of the 1 i owned