I still haven't heard an on-screen California-class crew complement or Cerritos crew numbers specifically, but Dr. T'ana says Cerritos has over 100 species for her to treat. That may include pets or dog-like beings that crewpersons are making themselves, but if she's specifically talking about crew... we've seen or heard of 28-ish types of sentients, so we can add 73 so-far-unseen non-humans to the 177-ish crew who've been spotted. And yet, some may look so human as to make no difference. Now with Kzinti!
I doubt T'Aana's statement would refer to pets. First, if there are any on the Cerritos, I think they would be called animal companions (as 'pets' seems demeaning considering that animals ARE considered sentient)... but setting that aside, we hadn't seen 23rd and 24th century crews with much (or any) of those to begin with.
Sure, if the crew has animal companions, this would likely refer mainly to a few people onboard, but probably not majority of the crew (and possibly not dog like pets).
We know O'Brien had a pet spider on the Enterprise-D... so think something like that or turtles even... possibly fish (like Picard had) - though those are fairly low maintenance and not sure if they would specifically fall under T'Ana's statement (but its possible since UFP doctors also seem to be capable of treating animal companions too).
Depending on how large California class ships are, and if the saucer is mainly where the crew quarters are (which seems likely)... then its possible T'Ana's statement would refer to mainly humanoid type species (and a few animal companion ones)
In essence, the Cerritos might have a more diverse crew than what we previously saw on other ships... plus its an animated series, so it can easily feature more alien species from UFP than a live action series.
The Cerritos saucer seems to have 11 decks, 10 of which might be in use for the crew quarters if you don't count the bridge.
Now, if the saucer is roughly similar to the Galaxy class in size (but obviously smaller), then it could easily have a crew compliment of about 200.
Given the overall shape of Cerritos saucer, it would have more internal volume compared to Intrepid class saucer section... so at the very least, you're looking at a crew compliment comparable to the one on Voyager - and since UFP in late 24th century has over 150 member planets... you can easily have that many alien species of that crew size (but the number of overall crewmembers is probably larger than 150).