What does Go mean in Sara Go Shirai

Hello i want know what does mean Go in the (Sara Go Shirai) or (Kana Go Kokura Shimauchi)
Thx all

I see that those are names of pedigree dogs.

"-go" is written as † in Japanese kanji, and is a suffix that is often used with names of dogs, horses, as well as some other names, such as the numbering of magazine issues, names of roads, numbering of typhoons (in Japan, typhoons come with numbers starting with the first one of the year, and like the tenth one of that year would be "ju (10)-go".)

That "†" is one of the suffixes(Ú”öŽĞ setsubi-ji), but in the old letters it was written "ċj".
"ŒĠ(tora)" on the right means "tiger", it expresses the symbol of strength or big existence.
Although it is a suffix, it is close to the meaning of "honorifics(ŒhÌ)" or "title(Ì†)" as usage.
https://en.wikipedia.org/wiki/Japanese_honorifics
However, it is not attached to all animals, it is limited to animals useful/helpful/worthful to humans.

Out of animals, it is also attached to the name of vehicles(now train and bus mainly),
but ships are more commonly using "ŠÛ(maru)", this ŠÛ is also often used for same animals.
https://www.kaijipr.or.jp/mamejiten/fune/fune_20.html
In the era when Samurai was there, it was also used to a boy name.
https://sengokumiman.com/youmeitouhyou.html
Attaching ŠÛ to the name of the ship was decided by ship law, but the provision of law is already gone,
but attaching † to such animals and others is not just a law but a "custom(tradition)".

† attached to names of magazines, roads, typhoons and more is also a suffix,
but this is a way of usage closse to "counter words (•”ŽŒ)".
https://en.wikipedia.org/wiki/Japanese_counter_word
The size notation of women's clothes still uses † is also famous as same usage.
https://top.dhc.co.jp/shop/fashion/fashion/size.html