Which dog has been the number one breed most?

It's impossible to definitively say which dog breed has been the number one breed "most" across all time and all countries. Here's why:

* Data availability is inconsistent: Breed popularity data is often collected by different organizations in different countries, and the data collection methods and time periods may vary significantly.

* Popularity fluctuates: Dog breed popularity trends change over time. A breed that was very popular in the past might not be as popular today, and vice versa.

* Global vs. regional: Popularity rankings can vary greatly from region to region. A breed that is very popular in one country might not be as popular in another.

However, some breeds consistently rank high in popularity:

* Labrador Retrievers: They've often topped the charts in the United States and other countries due to their friendly nature, intelligence, and adaptability.

* Golden Retrievers: Another popular breed, known for their gentle disposition and eagerness to please.

* German Shepherds: Known for their intelligence, loyalty, and work ethic, they are popular as family dogs and working dogs.

* French Bulldogs: This breed has surged in popularity in recent years, known for their compact size and playful personality.

* Poodles: They come in standard, miniature, and toy sizes, making them appealing to a variety of owners.

In conclusion, while it's tough to pinpoint a single breed as the "most popular" overall, several breeds consistently rank high in popularity across many countries.