Firefighter Phil McFarlane said watching the cat owners visit the cattery to see if their cat survived "has been difficult".
He added that they were working with the cattery owners to find how many cats were killed in the blaze.
More top news
Nottingham Forest fans are angry that a takeover deal has fallen through after weeks of talks.
It will be staying mostly dry but very cold for the evening.
Dry with clear spells overnight. Frost and fog patches likely.