
I have tried so many different things with my GR who is terrified of both thunder and fireworks - never used to be until we had an incident with a neighbour's fireworks :-( Last year he was so bad he was a danger to himself. As well as panting, drooling and pacing he also tries to dig or climb - and ended up trying to scale the fireguard and climb on top of the woodburner which was alight.
My vet prescribed Diazepam for him which makes a big difference - he still pants and drools but is more settled. He goes in a covered crate with the door left open and will settle there - still worried but not in danger. I sit next to his crate and groom him which is something he likes and it does help to relax him.
I was away this weekend at an agility show camping in a tent and nearby someone let some fireworks off late in the evening- so I had to put him in the crates in the car and then covered the whole car up with the reflective sheets I use and he settled quite quickly. The next night we had a huge thunderstorm right overhead and I had to give him the Diazepam and put him in the car crate and he actually settled down really well - no panting or drooling. Although he wasn't keen on either the fireworks nor the thunder he seemed to settle far quicker than he does when at home. I couldn't leave him in the tent with me as he would have escaped and run and I can't physically hold him when he is panicking and trying to escape.
His main fears seem to be at night when it is dark - we often hear the guns being tested and spare ammunition being blown up at an army range and that doesn't bother him at all, nor does gunshots heard when out walking, birdscarers or the maroon going off at the lifeboat station. I know a storm is coming an hour or so before it arrives as he becomes unsettled and starts to dig and climb way before any visible or audible signs are seen or heard.