The features you list are common in dogs. BCs and other working breeds, are very attached to their owner and seem to pefer human company;, some dogs snort; all dogs drink carefully but will wolf down food;sensible dogs only chase something worthwhile (all mine chase deer,none chase cats, the small ones, but not the big ones, chase rabbits); most oh mine are poor at catching but the good ones are stars at it; don't know about allergic, but the pup here has been swayed by TV ads and prefers advertised tinned and wet food, junk food, to the special, very expensive, dry food which the breeder recommended ! (He's now dropped his toy on the floor and is howling for me to pick it up for him, because he's too idle to get off his bed to pick it up himself! Weird. I refuse. )