As well as the 'charity begins at home' thing re adopting dogs, when they are brought into the country, particularly from Eastern Europe(there's quite a thriving trade in 'orphaned' dogs from Romania)there is no way of checking out their characteristics/personality or even their history.
At the moment there are quite a number of podencos, or Spanish hunting dogs, being re-homed in the UK. They are usually brought over by well- meaning animal lovers, half a dozen or so at a time. I will admit, they have been treated abominably by owners who then dump them at the end of the hunting season, but these are dogs who have never lived indoors and still retain their hunting instincts. 'Domesticating' such a
dog requires expert knowledge of the breed,something which few UK dog lovers have.
I do wish anyone wanting to adopt a dog would just use their local dog rehoming organisation who, if they are reputable will offer advice, and in difficult cases take a dog back for retraining or re-housing with a more suitable family.