Which of the following can be a cause for an abscess?

An abscess is a localized collection of pus that typically arises due to an infection following a break in the skin, such as a minor cut. When bacteria enter through a small wound, the body's immune response is activated, leading to inflammation and the formation of pus as a result of the body's efforts to fight the infection. This condition can occur quite commonly in dogs, especially when they are involved in activities that may cause minor injuries.

While excessive grooming can lead to skin irritation, improper diet may result in overall health problems, and environmental changes can stress an animal, these factors are less directly linked to the formation of abscesses compared to an injury such as a minor cut. A cut provides a direct pathway for bacteria, making it the most likely initial trigger for an abscess.