Diphenhydramine side effects in German Shepherd Dogs

78 FDA reports involve Diphenhydramine in a German Shepherd Dog. These are the problems they describe.

Vomiting
26 33%
Lethargy
19 24%
Loss of appetite
15 19%
Diarrhea
13 17%
Didn't work as expected
12 15%
Itching
11 14%
Allergic reaction
10 13%
Swelling
8 10%
Didn't stop fleas
7 9.0%
Breathing problems
7 9.0%
Death
7 9.0%
Skin rash or irritation
6 7.7%

All reports for Diphenhydramine in dogs