There are many signs and symptoms that one can get that indicates that they are allergic to dogs. The most common symptoms are sneezing, coughing, and watery eyes.
because they might have allergies
Dogs who have allergies frequently exhibit the following symptoms: chewing their feet often, licking their flank or groin often, rubbing their face often, wheezing, discharge in ears/nose, and bald spots in fur.
Wool allergies, flea allergies, food allergies, and skin allergies that can be genetic. (My CC has allergies.)
Yes a dog can have seizures from allergies
Yes it is possible
I am only familiar with Addison's disease in dogs. To the best of my knowledge it does not cause food allergies or a bad gall bladder. If a person/animal has not been diagnosed with Addison's Disease yet, some of the symptoms might mimic food allergies and gall bladder problems. The best thing to do is to contact you physician.
Maybe because of allergies if the dog is rolling on the grass a lot. Also, it might have got bitten.
yes
Most of the dogs don't, but some of the dogs do.
Just like some people have no allergies and some have allergies but to different plants than other people, dogs are the same way. If your dog scratches a lot during certain seasons but you don't see any sign of fleas, they might have allergies. More important is to make sure that dogs don't eat plants that can make them very sick or kill them. In the related links below there is a list, with photos, of such plants.
Yes,to dogs
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