i ,ve got a dog here thats been takeing quite a few doubled up and its only 13 month but i,m not going 2 start giving them by the self untill next season as i think i;ll spoil him he even took a few bites which it did,nt phase him 1 bit ,personally i think he would do 1 by heself what i,ve seen him do ,but takeing no chances,he got plenty of time