looking for breed specific protocols for anasethics
also warnings regarding the use of Xylazine
also protocols for using these drugs before , during and
after administering them to the dog.

Hi -

The following article lists anaesthetic drugs and combinations useful
for a multitude of species.  While not going into much detail about
xylazine, it does mention that there is a risk of bradycardia and
suggests that inhalation anaesthetics may be more appropriate.  Does
have a dog section.
http://www.iacuc.pitt.edu/druglist.pdf

A nice page, similar to the above, with more detail on the
administration procedure of anaesthetics in a variety of animals.
http://www.miami.edu/research/training/Anesthesia.html

Also, from the altwebsearch.org site suggested by tehuti-ga, I would
recommend the following page which is specific to procedures and
anaesthetic doses in the canine model:
http://altweb.jhsph.edu/publications/anzccart/dog.htm


More on the dangers of xylazine, if improperly used (in cats):
http://www.fabcats.org/is50.html

An article suggesting an alternative for ketamine/xylazine anaesthesia
in dogs (discusses decreased respiratory and cardiac output in the
xylazine group):
http://www.cpb.ouhsc.edu/ojvr/subscribersojvr/xylazine-ketamine2000/xylazine-ketamine2000.htm

The product sheet for a manufacturer of xylazine suggesting the
potential side-effects and necessary precautions:
http://www.lloydinc.com/llabs/anased20.html

Please let me know if you require further information about particular
administration techniques, anaesthetics, or had a particular danger of
xylazine that you wished me to investigate.

synarchy

It might be worth trying the Altweb pain management database. 
Although this focuses on analgesia and anesthesia in laboratory
animals, given that dogs are used in laboratory studies, some records
might be relevant to your need. I know that the compiler took a fairly
broad approach.
http://www.altwebsearch.org/aadb/aadb_search.cfm
(Warning: it can be slow at times)