unvaccinated adult dogs receive two rounds of vaccinations about three weeks apart after that dogs usually receive boosters annually the basic shots for distemper hepatitis parvovirus parainfluenza and sometimes leptospirosis and coronavirus usually are administered together in a combination vaccinenvaccinated adult dogs receive two rounds of vaccinations about three weeks apart after that dogs usually receive boosters annually the basic shots for distemper hepatitis parvovirus parainfluenza and sometimes leptospirosis and coronavirus usually are administered together in a combination vaccine
The following medical conditions are some of the possible causes of Hissing in ears. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Acute ear infection.  Chronic ear infection.
Obstructions in the Middle Ear. Blockages in the ear canal can cause pressure to build up in the inner ear, affecting the operation of the ear drum. Moreover, objects directly touching the ear drum can irritate the organ and cause the perception of tinnitus symptoms. Common obstructions include: 1  Excessive ear wax (ceruminosis). 2  Head congestion.