Hello,
There seems to be something about either the noise, the color, the characters, etc that bothers or interests him. It only happens on cooking shows? If so I would try to offer toys, lots of exercise and start conditioning him by offering a toy, a fun treat or something he loves when he starts to react to the show. It might also help to start training him to not be so reactive by turning the song all the way down and working on him acclimating to the show without noise, or try to turn the picture down. The point is to gradually keep exposing him to rhe stimuli at very small doses and not react to him when he reacts to it. Often owners worsen the anxiety or issue by yelling or reprimanding their dog. Never reprimand or yell it always makes things worse. And avoiding the tv will not help the situation and it may instead perpetuate it into other shows or even the tv when it’s not on.
Your dog is upset about something wrt the tv or that show help him work through it so you can both go back to enjoying your favorite tv shows.
Please also ask your vet for a positive reinforcement trainer. Often they will pick up on clues and provide tips you aren’t recognizing or understanding.
Good luck
Hello
If the itching and chewing is resulting in open wounds you need to seek veterinary help. In most cases something to stop the irch is needed along with antibiotics and an ecollar. They can have him felling better very soon.
My dogs had that aswell, my vet put them on antibiotics to fight any infections and to help healing and also gave them steroids to stop them scratching so much