I believe that you may be asking about abnormal vocalization (feel free to post another question if I am mistaken). Essentially, this means that a cat's meow is different than normal either in the pitch/tone (i.e. more of a yowl or howl rather than a quieter meow) or more frequent meowing. Abnormal vocalization can occur due to a number of underlying conditions, including a response to pain, stress, urethral obstruction, hyperthyroidism, among many other issues. If you are concerned that Pudge's vocalization may be abnormal, I do recommend taking him to his vet to assure that there isn't a bigger issue at hand. I hope this helps and that all goes well!