Dog biscuits are something I’d only ever give as a very rare treat to be honest. Even biscuits that are high quality and hamster safe tend to have protein and fat that’s a bit too high for hamsters IMO. There are definitely some smaller brands out there that are safe to give, but they take a lot of searching and analysis. Homemade biscuits are always an option! Searching through these forums may give you some good ideas for recipes