I keep terrier x lurchers and saluki x longdogs , I wouldnt x the 2 , they both do different jobs , my lurchers may keep with my saluki x for a minute maybe 2 on a good day but then its all over for them and the saluki x can go on for 4-5 mins and do it several times in a day , y would you want to x the 2 unless it was to put a little more wind into a bull or terrier x lurcher, certainly no help for bigland longdogs.