What does it mean when you cocker spaniel has swollen breast and pant a lot?

Swollen breasts in a cocker spaniel can indicate several issues, including hormonal changes, potential pregnancy, or mastitis (inflammation of the mammary glands). Excessive panting may suggest discomfort, pain, or stress, and could be related to the underlying issue causing the breast swelling. It's essential to consult a veterinarian for a proper diagnosis and treatment, as these symptoms may require immediate attention.