i used bitter apple with morgan. The first night i had her home she decided to go on a tasting spree around my room. so i put her in her pen and sprayed everything that was touching the ground (cords, desk legs, coffe table legs, yoga mat book case, sneakers, etc) with Bitter Apple. Then i took her back out and let her finish her tasting spree. That lasted all of 5 seconds. And she hasn't chewed anything since. She's now 9 months old and i don't have a chewed up anything in my house