Plenty of choices out their most will do the job, but i work 2 small jacks, i need them to get into really tight bramble therefore i like them small, able to work the thick stuff like silk, not having to crash through it like some bigger dogs do. Likes been said if you have plenty of earths might be worth you working something less prone to going to ground. Both my jacks are not from hardcore stuff, but saying that the little one has gone to ground 3 times.....only for a short while but it seemed like forever. I would def not get something too leggy though, would have to be a cocker or very sh