Raccoons can do a lot of damage to a big dog. I wouldn't recommend a dog for raccoons. 
 
Since raccoons are also a threat to your small dogs you may want to find out where they are getting into your yard and seal it off. You may need to run a hot wire on the top of any fencing to keep them out. They are very good climbers. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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