The Beatles, as you'll know, had various pets over the years
and clearly loved animals. So here's an overview of what I've read in various books concerning the pets of John, Paul, George
and Ringo and their pets...
John: various cats named Tim, Mimi, Elvis,
Salt, Pepper and Pyramus
Paul: Martha (of course), as well as cats,
called Thisbe, and a litter he named Jesus, Mary and Joseph (apparently, "Jesus ran off, Joseph stuck around for a long time
and Mary had kittens.")
Not really a pet, but Paul also bought a race horse called Drake's Drum for his father's birthday
George: cats named Corky, Rupert and Josstick;
and later a dog named Winston (he's on that photo of George and Dhani in '97, to be found in the Living in the Material World
Ringo: a poodle named Tiger; currently, he
& Barbara have a dog named Buster.