Sis's caption for this : I got a new brother; he looks just like me. But he won't speak with me. He won't bark at the mailman. and he doesn't chase his tail like me. why?

Sis's caption for this : I got a new brother; he looks just like me. But he won't speak with me. He won't bark at the mailman. and he doesn't chase his tail like me. why?