We live in Fort Collins, CO with our two cats, two dogs and a horse.We bought our first house in 2011 and after moving out in 2014 became first time landlords.

She has a pet(dog) who will be with her during the time she visits/stays at the rental property.The GF is not a co-applicant but just visits him and stays a day or two.How do I address this situation since we have a "No Pets" policy in all our rentals.Should I charge a pet fee every month along with a pet deposit or should I say "No Pets."

You can invest money in various tools which give you technological advances, or you can "Bird Dog" a market and find something where a HML will partner with you.  

We have two large dogs and in our last home (which was on the market all 3 years we lived there), having an agent constantly calling and bringing people in was a huge inconvenience.

Since I'm in Wilco I don't have a dog in this fight, but always watch with interest what happens down there.

Or you could get an option to buy it then bird dog it to another investor for a finders fee.

Try a dog whistle (that humans can't hear) that will entice an unauthorized dog to bark.

There's all kinds of big dogs in this forum. 

But, it now appears the flooring is damaged from dog urin (this is the smell issue mentioned), instead of a plumbing leak.  

That being said, my goal is to start out bird dogging for referral fees.