They make regular flat nylon training collars that have "choke chain" type of system. The good thing about them is that can adjust with size.
 
http://www.petco.com/product/117826/Coastal-Pet-Check-Personalized-Training-Dog-Collar-in-Red.aspx
 
 
As for real collars, I really recommend the lupine brand. They are a little expensive upfront, but they have a lifetime guarantee (even chewing) I have a dog that would gnaw on my others collar when playing. I just send in the chewed collar and they send me a replacement.
 
 
 
Are you sure the collar is fit right? If it is does not, it is not supposed to fit over their heads. I believe you are only supposed to fit 2 fingers in between the collar and skin.
 
"Adjust the collar to the appropriate size and fasten the buckle. The collar should be tight enough that it does not fall off, but loose enough that your dog can move her head up and down and not choke while performing normal daily activities."
	
		
			
		
		
	
				
			http://www.petco.com/product/117826/Coastal-Pet-Check-Personalized-Training-Dog-Collar-in-Red.aspx
As for real collars, I really recommend the lupine brand. They are a little expensive upfront, but they have a lifetime guarantee (even chewing) I have a dog that would gnaw on my others collar when playing. I just send in the chewed collar and they send me a replacement.
Are you sure the collar is fit right? If it is does not, it is not supposed to fit over their heads. I believe you are only supposed to fit 2 fingers in between the collar and skin.
"Adjust the collar to the appropriate size and fasten the buckle. The collar should be tight enough that it does not fall off, but loose enough that your dog can move her head up and down and not choke while performing normal daily activities."
 
	 
 
		 
 
		
 
 
		 
	
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		