[Rolo]

German Shepherd Dog

Among the most intelligent of breeds, the German shepherd dog is so intent on its mission — whatever that may be — that it is virtually unsurpassed in working versatility. It is utterly devoted and faithful. Aloof and suspicious toward strangers, it is protective of its home and family. It can be domineering. It can be aggressive toward other dogs, but it is usually good with other pets.

http://animal.discovery.com/guides/dogs/se...ile.jsp?id=1120

Yorkshire Terrier

The Yorkshire Terrier seems oblivious of its small size, ever eager for adventure and trouble. It is busy, inquisitive, bold, stubborn, and can be aggressive to strange dogs and small animals—in other words, it is true to its terrier heritage. Although some tend to bark a lot, it can easily be taught not to do so.

http://animal.discovery.com/guides/dogs/se...ile.jsp?id=2320

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