Here’s a common problem: you are an opera lover with a new pet and you want to come up with a name for your new friend that correctly expresses your love for opera. Here’s a slightly less common problem: you are a pet lover with a new appreciation for opera, and you want to rename your old pets with new, more operatic sounding names. In either case, I am here to help! Here are some suggestions, but feel free to make up your own, because unlike with human babies, it is okay to give pets completely ridiculous names.
Opera Names For Dogs
Poochiano Pavarotti
Richard Dogner
Black Laboheme
Dog Giovanni (also Dog Pasquale, Dog Carlo, etc.)
Tannschnauzer
Corgi fan tutte
Wertherrier
I Puppitani
Piquengese Dame
Martha
Opera Names For Cats
Der Rosenkatvalier
Purrsifal
Die Meowstersinger
Manon Lescat
Benjamin Kitten
Purrnani
Salomanx
La Cheetarentola
Prince Tigor
Feral Milnes
Opera Names For Birds
Leos Janachick
Papageno
The Flying Dutchman
Toucanna Netrebko
Simon Beakanegra
Bird of the Golden West
Joan Featherland
Opera Names For Pot Bellied Pigs
Pigoletto
Porky & Bess
Der Pig des Nibelungen
Giacomo Porcini
Opera Names For Fish
Mefishtofele
La Fish du Regiment
The Pearl Fishes
Opera Names For Rhinoceros
Rhino & Aeneas
Marilyn Horn

I would add:
Fiordileashy (dogs)
Adorabella (any pet)
Gugliyellmo (roosters)
Wer/tear (This one’s extra good cause it has punctuation and is good for any indoor animal)
And the sad one, applicable to all our departed pets: Decomposer.