by 
The Curious Bag
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Ear infections usually start in the outer part of a dog's ear before spreading deeper into the canal. Symptoms usually start when the ear infection is still new, giving dog owners plenty of time to get treatment for their pets.
Wet Ears
Dogs that swim or get wet a lot need their ears dried afterward, otherwise the moisture that is captured in the dog's ear can promote bacteria, yeast and fungus, which are known to cause infection. Dogs with floppy ears can often develop more infections, due to the lack of natural air flow to dry the ear canal.
Ear Wax
The build up of ear wax in a dog may accomodate fungus in the outter and inner ear canal which is a known cause of an ear infection.
Foreign Objects
Things like hair, fox tails and grass seeds can get caught in a dog's ear, which will cause an ear infection if the ears are not cleaned out properly and regularly. For this reason proper grooming for your pet is essential.
Growths
The presence of growths due to dirt and tumors inside the ear canal is an indicator of an ear infection and should be checked immiediately.
Cotton Swabs
Using a cotton swab to clean a dog's ear may push debris and dirt further into the ear canal, which can impact the wax and lead to infection.
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