Genuinely, there is almost nothing that works.
Minoxidyl, which I assume you're referring to as you mention pets, only works for hair loss caused by female pattern baldness which is hereditary. You can take it in tablet form, so no issue with pets.
I've tried everything. Minoxidyl does work a bit for me, but it only helps regrowth, it doesn't prevent shedding, and my regrowth cannot keep up with my shedding so it's big just the female pattern baldness causing my issue.
I don't know why I have hair loss. I have high ferritin, good iron absorption and no thyroid issues. Once that's checked the NHS doesn't care, so unless I go privately I'll never know. And I really don't think think there are any fixes.
HRT hasn't made any difference.
All the usual stuff - gentle washing, wrap in towel don't rub dry, not too much heat, don't dye, don't brush when wet, wear a hat, eat well etc etc. None of it prevents the birds nest I get in my hand every time I wash it.
(Various supplements online mainly only given me constipation and a lower bank balance)