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goldfish don't bite
They will do this. Puppies are most likely to bite each other's tails while playing, but adult dogs will also do so. It is usually a play gesture and not meant to be a serious attack. Dogs trained for fighting will also sometimes grab their rival by the tail; this is why the fighting breeds often have docked tails.
Goldfish put anything they can fit in there mouths.
yes
If the Koi is large enough it may well eat a goldfish fry but Goldfish and Koi are not fighting type fish so they do not normally bite one another.
Because they have no teeth to bite you with. They only nibble with their gums.
They usually do not bite, but use their tails for defense.
Pike
Not normally, but they can to severe frost bite.
They may bite, screech, and drop their tails.
Because other pigs bite them off.
There is no such thing as a "vampire goldfish". Except in dreams.well no one or no thing can eat a vampire gold fish because, they will bite it