Being there to pick out the dress is very very close friend territory.
I certainly wouldn't have had any of my mothers close friends at my dress choosing, but they were at our wedding which WE paid for.
I would think most people would want to include their parents dearest friends so that it would enhance their parents enjoyment of the day.
Not dozens of friends but certainly between 6-10 on each side.
If it is a tiny wedding I would let it go, but if its not and other friends are there, I could certainly understand your hurt.
No way would I be looking after the dog.
My friend was similarly hurt by an old friend that lived near her, apparently it was a very small wedding.
She is widowed.
But a couple of her friends "couple friends" were invited.
She shared her hurt with me but kept it to herself.
A year later she was recently retired from teaching, and was approached about child minding for two days a week as the daughter was desperately stuck and was returning to work.
My friend said if she had gone to the wedding she might have felt a bit obliged to say Yes, even for a short while.
But she was delighted to be able to say a firm No, without apology nor excuse.
Her friend told her she was a bit hurt that she hadn't even entertained it, as they are so close.....the irony🤔🙄.
They are still friends but there definitely was a cooling on my friends side, as she realised she had been a little too obliging and she has stepped well back from doing any favours.
She invested more in other friends and is really enjoying her retirement.
Her friend ended up taking early retirement to help her daughter, but isn't happy with how it restricts her and my friend is not around for pop in's as she is busy enjoying her free time.
It worked out well, despite her hurt at the time.
I hope it will for you too OP.