Does anyone have experience talking to a vet about there dog having allergies and taking zyrtec for it?? I have a 58 pound yellow lab and she keeps nibbling on her butt. Only really happens when the weather gets hotter...I live in the northeast. Every summer she also naws on her front legs. Prednisone works but I have to get a perscription for that and it is also a steriod so I'd like to find something safer and more accessible.