PS tea {and honey} contain a natural antiseptic - with tea, it's tannin - so there are times it's useful - just go for the decaffeinated ones!

Also, avoid nuts:

Walnuts are poisonous to dogs and should be avoided. In particular,
there is a type of fungus common to walnuts (especially wet deadfall
walnuts) that will cause severe episodes of seizuring. Many nuts are
not good for dogs in general, their high phosphorous content is said
to possibly lead to bladder stones."

Dogs can't seem to digest them anyway.

OK I'll shut up now!