The dog groomer suggests our Norwich Terrier takes medicine prior to grooming appointment. She bites the groomer. She originally went to this groomer and they only had problems cutting her nails. We went elsewhere and our dog bit at the groomer and they called me to come pick her up mid grooming and they couldn’t finish her. We went back to the present one who completed that cut. She went back today and got groomed but they said she needs meds next time. She is 7 yrs old and a rescue. We have had her almost 2 yrs. She sometimes nips at us too. Suggestions about meds please. Thanks.