Cats and dogs make up an essential part of the household for families in the United States. Close contact with pets can carry a risk of potential infectious disease transmission. This case series outlines causes of zoonotic pneumonia associated with cats and dogs, with a particular focus on the three cases presented of respiratory infection with Bordetella (B.) bronchiseptica and Pasteurella (P.) multocida in patients with an underlying malignancy. B. bronchiseptica is a rare bacterial pathogen in humans that can cause disease in immunocompromised individuals. Interpreting the significance of B. bronchiseptica as a pathogenic agent can be challenging given that this microbe often accompanies other organisms in culture. P. multocida is another important pathogen known to cause severe respiratory infection in immunocompromised populations or those with certain underlying comorbidities. A broadened differential for other bacterial etiologies of zoonotic respiratory infection acquired from dogs or cats includes Francisella tularensis, Yersinia pestis, Coxiella burnetii, and Bartonella henselae . These pathogens should be considered in the correct clinical context. Pets also play a role as reservoirs for the transmission of resistant bacteria such as methicillin-resistant Staphylococcus aureus (MRSA), methicillin-resistant Staphylococcus intermedius group (SIG), and extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae. Immunocompromised individuals must be educated on the potential for household transmission of zoonotic disease and how to limit certain types of close contact with pets. This report also highlights the importance of flea and tick control in pets for the prevention of zoonotic disease spread.

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