My cat died on Christmas he wouldn't eat or drink and I took him to the vet that was going to a biopsy but said it wouldn't do any good since my cat wasn't eating and had difficulty breathing and was sinus congested.
i had a cat with a tumar in the mouth once my cat meowed a lot and wouldnt eat hard food
I don't really understand the question… Tumors may be local, or invasive. That means that there may not be symptoms at all other than the presence of a growth.
If the tumor is invasive, then you may see other symptoms, such as lack of appetite, consitpation, difficulty breathing, lameness… the list continues depending on the sort of cancer and the location.