Which condition is specifically associated with acute onset and pain in certain dogs?

The condition that is specifically associated with acute onset and pain in certain dogs is orbital cellulitis or abscess. This condition typically arises due to bacterial infection resulting in inflammation and the accumulation of pus within the eye socket (orbit). Dogs experiencing orbital cellulitis or abscess often present with signs of significant discomfort, swelling around the eye, redness, and sometimes fever. The acute nature of the condition is marked by a rapid progression of symptoms, necessitating prompt veterinary intervention to prevent complications such as vision loss or spreading infection.

In contrast, orbital neoplasia often has a more gradual onset, with clinical signs developing over time rather than acutely. Zygomatic salivary gland issues usually present with signs related to salivary flow or gland enlargement, without the immediate pain associated with an acute condition. Masticatory muscle myositis is an inflammatory condition affecting the muscles used for chewing, leading to pain during jaw movement and difficulty in eating, but its onset is generally not as acute as that seen in orbital cellulitis/abscess.