Interesting post. None of mine have ever showed interest in juice (but
who knows what goes on in a cat's mind?) But why not?

http://www.aspca.org/site/PageServer?pagename=pro_apcc_dyk#7

Did You Know...the arrival of Spring and Summer brings lots of fresh
oranges, grapefruits, peaches, cherries, apples and many other delectable
fruits. However, certain parts of these fruits can be potentially
irritating - or even occasionally toxic in some situations- to our companion
animals.
The peels, fruit and seeds of citrus plants such as lemons, oranges, limes
and grapefruits contain varying amounts of citric acid, limonin and volatile
oils that can cause gastrointestinal irritation such as vomiting or diarrhea
if ingested. In some cases, exposures to high concentrations of these
substances (such as those found in certain citrus-based cleaners) could
possibly result in central nervous system depression as well. The stems,
leaves and seeds of apples, cherries, peaches, apricots and certain other
fruit trees contain cyanogenic glycosides that have the potential to cause
vomiting and loss of appetite, and in severe cases weakness, incoordination,
difficulty in breathing, hyperventilation, shock, coma and even death could
occur.

Typically, these severe effects develop from very large ingestions of plant
material that are more likely to occur with grazing animals such as horses
or other livestock. The consumption of a few segments of citrus fruit, an
apple or two or a few cherries would usually not be expected to cause
serious problems beyond perhaps minor stomach upset. However, it is
important for animal owners to be aware of the potential for problems that
these fruit trees can produce.

Angus hasn't shown any interest in juice but he has had drinks of
cordial and lemon, lime & bitters without any problems. He never drinks
very much.

Kate

my kitty regularly drinks from my apple juice and yesterday tried some
orange mango and passionfruit juice.  She didn't look impressed by it but
kept going back for more. Then again she eats chocolate chip cookies
too....hmmmm