Hi Rosie is 17wks now and has more so this last week really started to bite and nip. Chewing her lead. and being aggresive when i tell her No. Is this maybe the start of her being a juvenile dog or is she just pushing boundaries?? How do i deal with this as my voice just goes high pitch when i tell her off lol If indoors and shes a bit feisty i put her into kitchen behind gate until she.s calm down.