Lattimer from 'The Program' -- INSIDE DOGGIE RV ... See? No Piss Smell

"The Program" star Andrew Bryniarski let TMZ inside his RV to show the world ... his mobile home is well-stocked to care for 25 dogs -- but the problem is he's trying to prove it 4 days too late.

We broke the story ... Santa Monica cops arrested Andrew and his pregnant girlfriend over the weekend for animal cruelty -- claiming his RV contained 25 starving dogs ... with no sign of food or water ... and the place stunk of urine.

But Andrew invited a TMZ camera into the RV on Wednesday in an effort to show us cops had it all wrong -- and in the video the place is stocked with water, food, and other pet care essentials.

Our camera guy also swears the RV does NOT smell like pee.

Of course, Andrew was arrested Saturday night ... so it's entirely possible he cleaned the RV and bought a bunch of supplies after the fact.

Andrew insists he's legit ... telling us he purchased the RV from a local dog rescue to launch a mobile adoption center, and -- for what it's worth -- the rescue confirmed his story when we called.