I’m not familiar with hide glue either, never used it. I did find this on the internet.
What Is The Strongest Animal Glue?
The strongest type of animal glue comes from the hides and bones of cattle. This type of adhesive is made by prolonged boiling of connective tissue, resulting in a high-quality protein-based glue that can create an exceptionally strong bond. The hides of animals, particularly cows and rabbits, typically contain more collagen than bones or hooves.
Don’t know if this helps but thought I’d post it anyway.
It was on the internet, it must be true, right 😀