I would check local ordinances and then issue a lease violation based on what  animals should not be there.  

Given that marijuana is now legal in Ca, I'm not sure what the cops would even do about this....sounds like the worst you could get the tenant for is operating a commercial business out of your house without a license (likely a lease violation, but you already have them out, so...) 

I find it's best to give only one warning for lease violations.

Also a minor point re: 20 days: my understanding is that the 5 day demand letter can be sent after 15 days of lateness, which many people interpret to be the 16th, but depending on how you read the law, you're safer with the 17th and that's what I've always used.I also believe that if the tenants are habitually late, and you warn them repeatedly that they're violating the terms of the lease, you may be able to evict them for "reasons other than non-payment of rent" (which is a slightly slower type of eviction often used for things like repeatedly disturbing neighbors).You'd also want to be careful not to let them basically change the due date by always paying late, thus establishing (by repeated practice and your not informing them of lateness) a later due date by practice.But these are nuanced issues, not really germane to your current situation but something to keep in mind for the future and when discussing evictions with an attorney or other experienced RE investors.

I also have a $50 penalty per day for violations and it is back-dated to the day of discovery.

How about pre-forclosures, tax delinquent owners with code violations, Divorce, Probate, Eviction, distressed properties, absentee owners???

Tell them that violators will face a fine for illegal/improper dumping. 

The unscrupulous investor will:Have the homeowner sign a Quit Claim Deed in which the homeowner signs over their ownership in the property.Fail to explain to the homeowner that they, the homeowner, are still responsible for the mortgage.Fail to warn the homeowner that they could be violating their “due on sale clause” with their lender.The homeowner is usually elderly or part of an at-risk population (English isn’t their first language, disability of some kind, etc.).The Division advises the following when it comes to these types of rescue transactions:Don’t sign any documents or a deed to anyone until you have had a chance to talk with your lender and an attorney about your mortgage obligations and your legal rights.Colorado has a Foreclosure Protection Act that affords you certain rights when you are financially distressed.It’s best to take proactive steps when you first start having financial problems, and here are some resources that you can contact:Colorado Housing Connects –Colorado Foreclosure Hotline – Colorado Bar Association “Find-a-Lawyer” – Colorado Legal Services – Disability Law Colorado (Formerly The Legal Center for People with Disabilities and Older People) –

Make sure it explicitly explains the process for termination if you are unhappy with their services, but especially if they violate the terms of your agreement.3.

Make sure it explicitly explains the process for termination if you are unhappy with their services, but especially if they violate the terms of your agreement.3.