Totally oblivious of its small size, the Yorkshire Terrier is always eager for adventure and trouble. While affectionate toward their master, they may be suspicious of strangers. True to their terrier heritage, they can be aggressive toward strange dogs as well as small animals. They are best in households with older children, strictly for their own physical protection. They may be difficult to housebreak. A perfect companion, they require a lot of human attention, but should not be overly spoiled or they may become neurotic.