You've been turned into animals and half animals a lot lately. You decide just to start with an easy summon animal spell.
You think for a moment, trying to decide what type of animal would be best to summon. Something that will fit in the apartment, obviously. However, you also want to try to summon something that could fight. After all, if you use this spell it will probaly be to attack the other person.
You think this over, then shout the command word, "Companion!"
In a cloud of snoke, a Bengal Tiger appears in your apartment. Normally this would be a bad thing, but the tiger seems to be obediant to you thanks to the spell.
It sits down and stares at you, as if waiting for you to give it a command.
You could give it a command, or simply dismiss it, or try one of the spells that target animals, or transform him into a human!