Use a proper pronoun
There are rescue centres in the UK where/when you can adopt a pet whose/which needs a home.
WHERE - WHICH
Many cats live an average of 15 years, that/which is a long time in anybody's life.
Cat food is easy to afford, but there are cats, however whose / who vet bills can be expensive.
WHOSE
If you think you would like to rescue a cat, there are times WHERE/WHEN you can visit the rescue centres and ask for information and advice.
WHEN
Right now, there are cats in rescue centres all over the UK who/whose need a home.
WHO