This is from a painting by Bill O'Shea and is called "Boundary Rider".  I immediately thought of our cattle dog Brutus.  On the few occasions that Brutus ever came into contact with cattle his basic instinct came to the fore.  He would have been a wonderful working dog but we live on a normal surburban block of land so he never had the opportunity. I would have to say cattle dogs are amongst the toughest of breeds.

Brutus is with his collie friends at the Rainbow Bridge. 

Brutus the Australian Cattle Dog
Background from Boogie Jack
       
        
Autumn Illusions
        
Barking Best
        
Big Day
        
Collie Companion
        
Decoupage
        
Fairies in the Garden
        
Gracie's Fantasy Land
        
Hospitality
        
Keeper of the Flock
        
Learning the Trade
        
Morning Sunlight
         On the Alert
        
Play with Me
        
Spring Afternoon
         Staffie Slumber
         Swan Lake
        
Terrific Tris
        
        
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