I think my dog might have PTSD, is that possible?

So when he hears the iphone sound when you get a message he just starts shaking and walks to a corner with his tail between his legs and just sits there shaking for like 15 minutes, and it's only certain iphone sounds. Not all of them. We've had him for 11 years now and we got him when he was a couple months old. Does anyone know what the problem might be? I think he has it his whole life with certain sounds on a certain pitch i guess but i first found out when i got my iphone 4, so i immediately changed the sound. But now sometimes when a friend comes over they have the sound that he's scared of so i just want to know if there's a way to get rid of it

He probably has a variation of noise phobia. The only thing you can do is ask your friends and family members to put their phones on silent or vibrate when they enter the house.

He must have Vietnam flashbacks, don't pop fireworks in front of him

No i
its not possible as dogs do not suffer p.t.s.d. If they did nikki wouln have got it as he served several deeployments in Sandland. As an i.e.d. Dog I think my dog might have PTSD, is that possible - 1