Residence of Bristish Prime Minister, No.10 Downing Street has an official Chief Mouser Larry. The cat joined the No. 10 on 2011 and since then photobombed many world politicians. Former British Prime Minister once had to clarify in the British parliament that he loves "Larry, el gato" I wonder why he used the spanish to describe him
Gendered articles apply to every noun... person, animal, or thing. With pets you can denote its gender if known just as you do with people. I'm not sure if this would apply to all animals though. I've only ever heard native speakers do this in relation to pets.
la gata = the cat (feminine)
el gato = the cat (masculine)