no, a little bit of anything doesn't hurt
remember every chemical can cause cancer in chemistry lab, but our body is able to resist a little bit.
Even I give a small pice of chocolate once or twice a month
and did i tell ya that onion is bad for dogs too, but wat if u hav them in vegetables
PS: Btw dont be too paranoid and dont do silly things like dog trainer etc, the dog needs care from its owner and not from someone else.
And just check that his legs do not deform, its a common thing that can happen due to less calcium and do some massage to legs too.
And dogs usually show some signs and gesture i they want to pee or sh!t. Just observe them and do as appropriate.