two brothers dog are adult littermates. two australian shepherds run on forest road in summer. happy best friends aussie red

australian shepherd aussie dog pet animal outside red merle tricolor smile cheerful chocolate color shaggy happiness fluffy happy park brown trees green forest leaves trail road spring summer early autumn nature walk fall run active energy two friends best friend brother littermate breed thoroughbred canine cute purebred young mammal outdoor fur beautiful pedigree looking outdoors view brothers are adult littermates shepherds summer have fun together park front view littermates