There is absolutely nothing distressing about dogs in this movie! The only indication that a dog is dead is because of a big time jump where an elderly man looks back on his life and you could assume it is likely the dog lived its full life by then. He has beautiful loving memories of the dog, who hangs out with him at times in the move but otherwise lives just fine because the dog lives in the wild (the man is gone for months at a time). There is never any indication of a dog suffering or neglected or put in danger or anything like that at all so don't hesitate on this movie because of that! It is beautiful.
*SPOILER* Main character’s family is presumed dead after a fire burns their home down while the character is away. No goodbye, and no closure confirmation/on their deaths either.
To add to the other comment, it’s around 1 hour 12 minutes 50 seconds on Netflix. It is audio and visual. Look away and mute for 20 seconds (all good by 1 hour 13 minutes and 10 seconds)
There are moments of extreme anxiety for the main character but I wouldnt say full panic attack and nothing that would cause myself to have a panic attack (if you also have them when you hear them)