I've just received a wonderful review from a client who I've been working with on separation distress (for their rescue hound mix Daisy, isn't she the cutest).
We've been working together for a while, months! As that is what it (mostly) takes to help a dog over separation related issues (commonly known as 'separation anxiety').
We went from helping her to get over initial departure triggers (I.e. the human putting on shoes or a coat - slowly changing her association from panicked to relaxed) to slowly building up duration of absences (3mins, 5mins, slowly slowly is most often the key to success, teaching the dog a routine that surrounds the human coming back).
Daisy happily copes with 90 minutes now, sometimes even longer. Any longer is still difficult for her though so we are taking it back to baby steps, to help her over that hurdle gently.

Also, she went from hating long car journeys to breezily traveling along now. And from pulling like a truck on the lead to happily bouncing alongside her humans. All down to her humans' effort and care, being patient and understanding and just so so wonderful with her.

I do love my job!
Go Daisy!