While they may smell good, many liquid potpourri products contain ingredients that can cause oral ulcerations and other problems, so keep them out of the reach of your pets. (vscot.com)
RHINOTRACHEITIS (feline herpes virus 1) & CALICI VIRUSES are the primary stimulants of upper respiratory infection in the feline species, capable of causing clinical signs localized to the upper respiratory system such as sneezing, ocular discharge, and oral ulcerations as well systemic infections in more virulent strains of calici viruses. (harmonyanimalvet.com)