I'm far from California, but the bottom line is, if the neighbors don't complain about the dogs, probably nothing will ever become of it. But it only takes one complaint and then you've go to come up with an explanation. You might be "living" on the property, but you can always use the story your are just visiting and some of the dogs are yours.
However, if the neighbors are mean-spirited and vengeful (like some can be), they may be documenting and taking photos, and over longevity can prove you have been staying there long term. It's really up to you how you want to handle that.
Here again, zoning laws are different for every square inch in the USA. Where I live, my property is is zoned "single family dwelling". All around me is zoned "agriculture." My property is zoned in such a way, we can park RV, burn our own trash, and pee behind our own trees! There's no restrictions to hooking up an RV for use. The clincher is though, the property is still zoned "single family dwelling". If someone other than us lives in the RV, then the property becomes multi family dwelling, and / or if accepting rent for living there, it could be considered we are using the land for a "business" and we would be in violation of zoning. Granted, someone would have to squeel on us first. It would be very doubtful in my area anyone would.
What I'm saying is, each locale has it's own set of laws restrictions. And even differences can be found between county and county, and even between township and township within the same county. Or in my case, if I climb over the fence in my back yard, I'm standing in a totally different zoning type!
I doubt anyone on these forums can give you a correct answer. Your "landlord" needs to check the local laws in your jurisdiction. I do feel pretty certain of this, as far as the property you are currently sleeping on... you have no investment. If anyone gets fined or in trouble, it will be the property owner. You have wheels, you can leave. He may get mad at you for doing that, but inevitably, the responsibility for how his property is being used is HIS...Not yours.
About your license and vehicle registration and registration of your pets? As long as everything matches, and you are "mobile", where you put your head at night can be anywhere. But whatever you do, obey he rules and laws for the jurisdiction where you have everything licensed and if stopped for any reason, explain to law enforcement you are there only temporary, especially since you can validate you are living from your RV. (Think in terms of college students who attend school and live in the dormitory in a completely different state than their home. Yet they take with them the old family car.)
