External or internal ottitis. IE A ear infection. You need to make a vet appointment within 24 hours as this is accutely painful for your dog and can result in a ruptured ear drum and deafness.
If there is any thing swollen or if your dogs limping and wineing
boxer dogs
Boxer dogs. You better belive it.
of curse yes
You can separate the dogs when it's feeding time, like a separate room. Or, you can keep the dogs apart with a baby gate.
because you have a ear infection.
They can be if you train them the right way.
Because they're dogs...
allergy
A boxer dog is a jogger because it is a submissive dog.
Food
water.