My 8 month old cat will not stop chewing things?

It is possible that he is hungry, bored (even with Cookie) anxious or has just gotten into this habit. Does he chew or does he actually ingest things?

Pica, the ingestion of things that are not food can be a nutritional deficiency or a compulsive behavior and, sometimes, hunger. Some oriental breeds like the Siamese need more time with their mothers (12 weeks perhaps instead of the normal 8) and can suck and eat wool and other fabrics the rest of their lives.

Have you tried some cat grass or fresh catnip sprigs? You can also slice lettuce into thin slices and see if your cat will chew on those. They might add enough bulk to his diet so he doesn't chew on things like plastic.

In a multicat household, it can help to have a tall cat tree or shelving that the cats can climb. It can help reduce any social stress and provide more exercise.

For wires, there are lots of inexpensive contraptions to bind them up and hide them away from pets. Some pets actually like the taste of Bitter Apple and Pepper Sauce!

http://www.metpet.com/Reference/House/Reduce%20Cor...

Tape cords to the wall with electrical tape to help prevent your pet from gaining access to them.

Stow excess lengths of cord behind furniture or appliances, hidden from your pet's view. Cats are attracted to dangling cords and may think they are toys.

Block access to visible cords by wrapping flexible safety cable (available at hardware stores) around them.

Place contact paper, sticky side up, in the general area of electrical cords to discourage your pet from approaching them.

Apply unpleasant-tasting substances to exposed cords. These could include bitter apple spray, hot-pepper sauce, menthol, toothpaste, mouthwash or lemon juice. Experiment with different flavors, since pets' taste aversions vary.

If you can't put away all the fabric and leather items your cat likes to chew on, try the bitter apple spray on the area where he usually chews, but test it first on a small hidden seam.

Training your dog will be a huge part of your interaction with him for the first few months. Learn here https://tr.im/gPKax

This includes housetraining, leash training, obedience training, socialization, and problem solving. In addition to providing your dog with needed skills, this time will also be a great opportunity for you to bond with him. Take the time to really get to know your pet while training him and a loving relationship will easily develop.