My sister and I both have Siberians. They can have very sensitive stomachs and we both went through so many different foods in the first two years. We both now get Applaws. We both only get fish even though our breeder advised against fish. They love it and have healthy bowels.
https://www.amazon.com/stores/Applaws/page/29EEC4F8-D434-4389-BA80-DE05D5CBD0CD?ref_=ast_bln
As for their favorite toy… don’t laugh.
https://www.amazon.com/gp/aw/d/B07XD9CMZ8?ref=ppx_pt2_mob_b_prod_image
I just ordered the 60 pack bc they get lost or broken. They are CRAZY about these things… I don’t get it.