Plz help... my dog is sick and i dont know what to do

MY DOG ATE A BONE EARLIER AND I THINK IT MAY BE THE CAUSE… HE CANT GET SICK OR HAVE A BOWEL MOVEMENT… HE’S BLOATED AND BLOWN UP LITERALLY LIKE A BALLOON… HE SEEMS TO BE BREATHING OK BUT IN ALOT OF PAIN AND DOES NOT LOOK GOOD… HIS VET IS ON VACATION AND THE OTHER ONE AROUND HERE WONT ANSWER THE EMERGENCY LINE. DOES ANYBODY HAVE A SUGGESTION?