Contrary to what industries will tell you, not everything that is sold in stores is suitable for your pet (this is valid for cats also, with their respective specificities).
Food that is too tough will possibly hurt his gums, and maybe even break his teeth. If the bone breaks "improperly", it might scratch his digestive tract, which will lead to infections and further trouble.
There are countless articles on the net written WITHOUT sponsorship, all of them bringing testimony against tough toys and tough food. The bones and the muscles used in chewing were made for food, not for crushing stones.
You must be aware that even bones which are not tough, are able to hurt the dog. Especially: big bird-bones (they splinter) and fish bones.
Note: all cooked / boiled bones are unsuitable to be chewed by pets - they are too tough.
You can successfully feed small bird-bones (phalanges, chest, head / neck), the (soft) endings of bigger bones etc.
outside of the country ... they have to put pesticides ...
Are you claiming that USA is pesticide free? They are already in everything we eat, regardless of the country, especially when talking about "civilized" countries. We = animals, birds, humans...
Bonus info: pesticides are only a part of the problem. There are also hormones, medicine, heavy metals, additives ...
So from this point of view, domestic or imported products, it is the same.
Question to self: aren't pesticides used only in agriculture, to kill the insects which damage crops?