Oooh he's gorgeous Brizzle
Is he Rex or Teddy (it's the whiskers that are the giveaway , Rex have curly whiskers, Teddy have straight .
They keep growing till the are 2yo
and get huge (our Rex boar was 1.4kg at a year, our Teddy was smaller)
My grey names are Storm or Taggart but your boy is Mowgli , it suits him 
Welcome to MN Mowgli ........
Did you buy the hay that you went out for ?