Which of the following is true about Doxycycline?

Doxycycline is a broad-spectrum antibiotic that belongs to the tetracycline class of antibiotics. One of its notable characteristics is that it is available in various formulations, which is why the statement about it coming in formulations other than tablets is correct. Doxycycline can be found in oral tablets, capsules, and liquid form, as well as injectable formulations. This versatility accommodates different patient needs and administration routes, making it a widely used medication in veterinary medicine.

Other statements present some limitations or specific contexts that don’t encompass the full range of Doxycycline's use and effectiveness in veterinary settings. For instance, while Doxycycline can be used for respiratory infections, it is also indicated for a variety of other infections, making the focus solely on respiratory issues incomplete. The administration of Doxycycline can sometimes be less effective if given with food, but there are instances where it might still be administered with food to minimize gastrointestinal upset. Long-term use of antibiotics is generally approached cautiously due to potential side effects, but it isn't inherently unsuitable; rather, it's a matter of careful consideration of the patient’s condition and response to the medication over time.