If you upload a new photo, make sure that both source and copyright are OK (e.g., name of photographer and GFDL) and add to the album.
Use the best breed photo available for the infobox image.
image_alt: Alternate text to describe an image to those that cannot see it.
If an image is included, alt text should be provided using image_alt. Alt text should not repeat the caption; instead, it should describe the image to someone who can't see it (see WP:ALT).
image_caption: A caption that describes the image.
Include a caption that mentions the coat-color, tail, ear, etc. variation and whether the dog is, for example, a puppy or nonstandard in other ways; Wikipedia standard now seems to be for full sentences, but if it's only a coat color variation we haven't been doing full sentences, just Blue merle Aussie or the like.
altname: Other names by which the breed is known by English speakers.
The list of names for the breed in the FCI standards is a good starting point; also can include common breed names from other English-speaking countries and kennel clubs. User:Sannse initially created a useful spreadsheet listing these known about for new articles (can also use Google search for English web sites for the possible breed names).
To specify more than one name, you must specify them all on one line separated by <br>
nickname: Common nicknames
These are shortened names that aren't an official breed name but that are in common use by owners or breeders of these dogs (e.g., "Doxie" for Dachshund; "GSD" for German Shepherd Dog).
As above, to specify more than one name, you must specify them all on one line separated by <br>
country: Country of origin, preferably at time of origin to avoid squabbling over current political boundaries.
Also available on the spreadsheet (or see breed's FCI listing - but be aware that the country listed may be the country responsible for the standard and not the true country of origin).
patronage: Country of patronage, according to the Article 2 Objectives, Section II, Paragraph g) of the Statutes of the Fédération Cynologique Internationale, used when no country of origin is responsible for the breed and in some other cases.
weight: The general weight range
maleweight: The weight range of males
femaleweight: The weight range of females
height: The general height range
maleheight: The height range of males
femaleheight: The height range of females
coat: The coat type
color: The color
litter_size: The range in size of a litter
life_span: The range in life span in years
Classification and breed standards
FCI standards; all four options are required.
fcigroup: The name of the group to which the dog belongs. (Hound, Working, etc..)
fcisection: The section number of the above group.