A-frame: The A-frame is a pair of planks joined in the middle at an angle so that they resemble the peak of the letter A. There are “contact” areas indicated by contrasting colors which are painted on the frame and dictate where the dog must step. The dog must go up one side and down the other, contacting the plank in the right places on each side.
Prong collars must never be turned inside out (with the prongs facing away from the dog's skin), as this may cause injury against the body and head.  Plastic tips are occasionally placed on the ends of the prongs to protect against tufts forming in the fur or, in the case of low quality manufactured collars with rough chisel cut ends, puncturing the skin. Like the slip collar, the prong collar is placed high on the dog's neck, just behind the ears, at the most sensitive point.
Feed your dog a high-quality diet with appropriate amounts of protein. If your dog spends most of his days lounging in your condo, don’t feed him food with a protein level that is ideal for dogs who herd sheep all day. The money that you will spend on feeding an appropriate quality food will often be money that you save in vet bills later on. I recommend you always check with your veterinarian for the right diet for your dog.