所有主-2: 友人の犬は、ウェルシュ・コーギーです。

Excite!&@nifty:
Friend's dog is a Welsh Corgi.

Livedoor:
A friend's dog is Welch Caux Gee.

Yahoo!:
The dog of the friend is Welsh Coe Guy.

OCN:
Friend's dog is an welsh Corgi.

BabelFish:
The dog of the friend is [uerushiyu] [kogi].

Google:
My friend's dog is a Welch corgi.

Bing Translator:
Friend's dog is a Welsh CORGI.

Summary)
Excite, OCN, and Bing do not add any article to "friend."