Every site owner who has bought or earned links eventually asks the same question: “Why doesn't Google show all my backlinks?” Some assume the links don't count. Others assume a tool is broken. In May 2003, thousands of webmasters asked a version of that question at the same time, because Google seemed to change how it counted links almost overnight.
The community called that month's update Dominic. It came right after Cassandra, and it is listed in our timeline of every Google algorithm update as the update that changed how backlinks were counted and reported.
Let me explain, in plain words, what people noticed during Dominic, why Google's crawlers were at the center of it, what is known versus guessed, and what it still teaches you about measuring links.
Dominic update at a glance
| Question | Answer |
|---|---|
| When | May 2003 (month only), per the SEOmoz history quoted by Search Engine Roundtable and Search Engine Land |
| Type | Monthly index update; changes to link counting and crawling |
| Confirmed by Google? | No formal statement |
| What it changed | How backlinks were counted and reported, per Wikipedia and Moz's history (via HubSpot) |
| Also noticed | New crawler behavior; webmasters reported new Google bots |
| Who was affected | Broad; many sites reported backlink and PageRank changes |
Where Dominic fits after Boston and Cassandra
By spring 2003, webmasters were used to a rhythm. Google refreshed its index about once a month, and each refresh took about a week to spread across data centers. Matt Cutts later confirmed that pattern in a 2006 post explaining Google’s update types. The community named each monthly update: Boston in February, Cassandra in April, then Dominic in May.
Cassandra had a clear target: hidden text and links between co-owned sites. Dominic was murkier. It felt less like a spam crackdown and more like Google was changing the machinery underneath, the crawlers and the way link data flowed into rankings. Looking back, that is exactly what was happening, because within two months the monthly cycle would end altogether.
Freshbot vs Deepcrawler: what webmasters saw in May 2003
To follow Dominic, you need the two crawler nicknames everyone used at the time.
| Deepcrawler (“Deepbot”) | Freshbot | |
|---|---|---|
| How often | Roughly once a month | Continuously, favoring pages that changed often |
| What it fed | The next full index, including PageRank and backlinks | Quick updates between full refreshes |
| Visible sign | Changes showed at the monthly update | A date sometimes appeared next to a result |
| Effect on links | New links counted after the next update | Widely believed not to pass link data |
That last row matters. In a March 2003 thread, a member explained that new links usually only counted after the deep crawler found them and the next update ran, and suggested waiting 40 to 60 days. In another March 2003 thread, a respected member put it simply: “The main difference now is that PageRank (and backlinks) change at the full update.”
Barry Schwartz later summarized GoogleGuy's explanation of Freshbot in a 2004 Search Engine Roundtable post: Freshbot had revisited frequently updated pages more often than the roughly monthly deep crawl, and it had become much more capable since.
The May 2003 theory: a “slow waltz” instead of a monthly dance
During Dominic, webmasters noticed something odd. Freshbot kept crawling deep into sites, while the usual late-month deep crawl seemed to be missing. On May 15, 2003, a member opened a WebmasterWorld thread suggesting Google might be moving from a monthly dance to a continuous “Slow Waltz.” The forum's founder, Brett Tabke, floated the term “Liquid PR” for the idea of PageRank updating continuously rather than once a month.
Others in the thread were skeptical and said it was one possible explanation, not the only one. That skepticism was healthy. But a month later, the theory looked a lot better. A June 20, 2003 post, “DeepBot 2 aka DeepFreshBot small FAQ,” argued that the old deep crawler was gone:
“Our familiar Deep bot is retired.”
— A WebmasterWorld member, WebmasterWorld: “DeepBot 2 aka DeepFreshBot small FAQ” (June 20, 2003)
The same author wrote that updates were “no longer bringing in data that is always 1 month old,” because deep data was now gathered over time instead of in one burst. These are a forum member's observations, not Google statements, so I treat them as informed guesses. Still, they line up with what Google later confirmed about the move to incremental indexing in the Fritz update.
What changed in how backlinks were counted
Here is everything the record actually supports about Dominic and links:
- Wikipedia’s timeline, citing the WebmasterWorld thread “Understanding Dominic,” says commentators believed the update “affected the way backlinks were counted,” and that many webmasters reported new Google bots.
- Moz's update history, as reproduced by HubSpot, describes “improvements to the counting & reporting of backlinks.”
- In the May 15 thread, the opening post described sites dropping to PageRank 0 with no backlinks counted.
- In the June “DeepBot 2” FAQ, the author said recent backlinks might now show sooner, while older links on deeply buried pages might not be counted yet.
- In early July, a member in the “Fresh Behavior” thread noted that data centers began showing equal backlinks after the following update.
Put together, the most reasonable reading is this: Dominic coincided with a change in how link data was collected (a new crawl model) and possibly which links were counted. The reporting changed too, which is why backlink numbers looked so strange that month. What Google changed exactly, nobody outside Google knew.
Reported ranking swings during Dominic
Like every 2003 update, Dominic produced long forum threads full of winners and losers. Sites that had relied on a small number of links sometimes dropped sharply when those links seemed to disappear. Others rose. Results looked different from one data center to the next for longer than usual, which added to the confusion.
There is no reliable data on how big the swings were. No rank-tracking studies from May 2003 survive in the sources I could find. So when you read that Dominic “devastated” a type of site, ask for evidence. I would describe it as a confusing, unstable month rather than a targeted strike.
A worked example: why new links “vanished” in 2003
Here is a hypothetical example of what a small site owner might have seen, based on the patterns members described.
- April: Google's backlink report shows 40 links to your home page. You add 10 more from new directory pages.
- Early May: the usual deep crawl doesn't appear in your logs, but Freshbot visits often.
- Mid May (Dominic): the backlink report shows 22 links. Your ranking slips from position 6 to position 11.
- June: the count recovers to 45, and the ranking returns to around position 7.
In this example, the links didn't disappear. Google's way of collecting and showing them changed mid-cycle, and older linking pages had not been recrawled under the new model. A webmaster who panicked in step 3 and started buying links might have made things worse. One who waited would have seen most of it settle.
What Dominic meant for link building in 2003
Dominic didn't end link building. But it nudged people toward habits that still make sense:
- Don't build a strategy on one reported number. If Google's own backlink count could halve in a month, it was never a precise measure.
- Get links on pages Google crawls often. The DeepBot 2 author believed pages closer to the home page were refreshed more often. A link buried five clicks deep on a weak site might take a long time to count.
- Prefer fewer relevant links over many weak ones. Members were already saying in March 2003 that one good link with the right anchor text beat many off-topic ones.
- Wait before judging. Changes in link data took time to show, a lesson that still holds.
Lessons for measuring links today
Google's link analysis today is far more advanced. Its ranking systems guide still lists link analysis among its systems and says PageRank was “one of our core ranking systems used when Google first launched.” But the measurement problem from Dominic never went away. Here is how I suggest you handle it:
- Use more than one source. Search Console's links report shows a sample of what Google knows; third-party tools crawl the web on their own. See our guide to checking your backlinks.
- Track referring domains, not raw link counts. One site linking 500 times is still one site. Our post on referring domains vs backlinks explains why.
- Expect counts to move without any ranking change. Tools recrawl, drop dead pages and update their data. A drop in a tool is not a drop in Google.
- Judge links by outcomes: rankings for the pages you care about, referral traffic and leads over several weeks.
If backlinks are new to you, start with our free lesson on what backlinks are, then come back to the history.
Questions webmasters ask about the Dominic update
What did the Dominic update change?
The most consistent report is that it changed how Google counted and reported backlinks. Wikipedia's timeline says commentators believed it “affected the way backlinks were counted,” and Moz's history describes “improvements to the counting & reporting of backlinks.” Google never published details.
What were Freshbot and Deepcrawler?
They were webmaster nicknames for Google's two crawl patterns. The deep crawler visited the web broadly about once a month and fed the full index, PageRank and backlinks. Freshbot revisited frequently changing pages between updates. Around Dominic, members reported that the two were merging.
Why did my backlink count drop during Dominic?
Many webmasters in May 2003 reported lower backlink counts or even PageRank 0 on some pages. Nobody outside Google knew for sure why. The most common theories were a change in which links Google counted and a new crawl model that had not yet picked up older, deeply buried linking pages.
Does Dominic matter for SEO today?
Not directly. Google's crawling and link analysis have changed completely. What remains useful is the habit it taught: backlink counts shown by any tool are an estimate, so judge link building by referring domains, relevance and results, not by one number.
What to take from the Dominic update into your link reporting
In brief: Dominic in May 2003 is remembered for changing how Google counted and reported backlinks, during a month when Google's crawlers were clearly changing. The details were never confirmed, and much of what we know comes from forum observations. But it was a clear step toward the end of the monthly Google Dance, which came with Esmeralda and Fritz.
If your link reports are confusing, or you are not sure whether your link building is working, talk to our team. We will look at your links and rankings with you and give you a straight answer. You can also read more about our SEO services, or how we see PageRank and link analysis after a decade of link updates.
Google updates around the same time
Before this update:
- The Cassandra Update (April 2003): Google's Early Crackdown on Hidden Text and Link Swaps (Apr 2003)
- Google's Boston Update (February 2003): The First Named Google Update (Feb 2003)
After this update:
- The Esmeralda Update (June 2003): The End of the Monthly Google Dance (Jun 2003)
- The Fritz Update (July 2003): Google Moves to Daily Index Updates (Jul 2003)
Or browse every Google update on one timeline, newest first.
Sources for this Dominic update history
- Timeline of Google Search (Wikipedia)
- HubSpot on SlideShare: A Visual History of Google Algorithm Changes (based on Moz)
- WebmasterWorld: “Possible explanation? Regarding Google's recent activities” (May 15, 2003)
- WebmasterWorld: “DeepBot 2 aka DeepFreshBot small FAQ” (June 20, 2003)
- WebmasterWorld: “What the update does and doesn't do?” (March 1, 2003)
- WebmasterWorld: “Are updates based on deepbot or freshbot crawls or both?” (March 2003)
- WebmasterWorld: “Fresh Behavior” (July 1, 2003)
- Search Engine Roundtable: Freshbot Date on Google SERPs (April 29, 2004)
- Search Engine Roundtable: comparing Google update lists
- Search Engine Land: Major Google Updates Documented
- Matt Cutts: Explaining algorithm updates and data refreshes (December 23, 2006)
- Google Search Central: A guide to Google Search ranking systems
