i prefer bull crosses cause nothing phases them. my bull cross bitch was like an adult dog from 5 weeks old!!!! they love as much work as you can throw at them and then some!! good feet,nose,stamina,jaw power,athletic,nice to look at and there character is another massive influence to me so loyal an full of life all the time and none of the constant reassurance needed in some collie crosses. good guard dogs aswell, good with kids,people and other dogs if brought up right what more can i say apart from BULL CROSSES ARE ACE!!!! atb jimmy