OneMind Dogs methodology applies to dogs of any size and shape.
We have written some articles with video links of many different breeds competing and training with the OneMind Dogs methodology:

https://www.oneminddogs.com/article/onemind-agility-different-dog-breeds/
​https://www.oneminddogs.com/article/onemind-agility-different-dog-breeds-training/
The next level episodes often showcase a large variety of breeds as approximately 80% of Jaakko and Janita's students have dogs that are not Border Collies. 

This next level episode is one example of different breeds training OneMind Dogs, there are both small dogs and large dogs in one group. 

Many of the technique training videos also showcase both large dogs and smaller dogs. Such as this video for the V-Set.  

You can also check out our Blog for many great stories involving OneMind Dogs pack members and a variety of different breeds.