#16 There should be no unnecessary and cheap fillers such as slaughterhouse waste and grain in the feed, nor should there be flavor enhancers. The main ingredient should definitely be high-quality meat.
#17 If you want to buy a Rat Terrier, you should first look for a reputable Rat Terrier breeder.
Unfortunately, there aren't many of them in Europe - you're more likely to find them in the USA. You should expect a price of around $500 to $900 for the four-legged friend.