Aanyone ever had this in terriers I no they aint machines and are a living thing and all that ,but my [BANNED TEXT] has a well seasoned black dog nuttall/wheeler bred typical hard en but not too hard always had good seasons worth of sport with him now about 4 and half year old. went out with him last week marked strong at the earth went in like a rocket as usual . 30 mins came out and didn't wanna enter again obvious signs of him mixing with something .. anyways tried him again this morning and he wouldn't even enter but my young dog did and we had a morning of it .he has never been a dog agg