Saying you can or can't teach something to someone once they've gotten past the time when they learned their ideals/ways. Saying you can or can't change someones mind about their long term opinions or beliefs. can be referring to a human as well.
A: my dog won't listen when I tell him to sit!
B: yeah, you can't teach an old dog new tricks.

A: but can't you just hear me out on this, B?
B: no! I made up my mind a long time ago.
A: *sigh* you can't teach an old dog new tricks.

A: I'm 70 years old but I just learned rock climbing!
B: you can teach an old dog new tricks!
by Rileyisafk December 18, 2022
Get the Old dog new trick mug.
A dirty dick. When the penis is not washed between sex with different, multiple partners.
I could smell his old wet dog before he railed me but I didn’t care.

Your penis tastes like a fishy snatch. You feeding me an old wet dog?

My wife divorced me after one wet dog too many.
by Dick Onchin October 14, 2020
Get the Old Wet Dog mug.
A dog (usually a small breed) that was owned by an old lady and was spoiled because she treated it like a baby. Old lady dogs tend to be very demanding of your attention, and will jump into your lap whenever you sit down. Quite often they hate males, but love females. Can be very sweet if broken of 'granchild-like' expectations. Do not get along well with other animals, and become jealous very easily. May be accustomed to riding in a stroller and being dressed up in cute outfits. They like to bounce and prance around like bunnies in order to get attention. Also, they'll intentionally shake to get your attention.
When my mother brought home another dog, I was surprised to find that he had been an old lady dog.
by Nomad-Putin December 29, 2011
Get the old lady dog mug.
Feeling or looking so awful you should be poop-scooped and thrown away for the health of the innocent passerby.
"Woke up after the party feelin' like a day old dog turd on a hot sidewalk."

"Even after the Botox, she looks like a day old dog turd on a hot sidewalk."
by BigBadKittyPoo August 11, 2009
Get the like a day old dog turd on a hot sidewalk mug.
OHHH damn my old sea dog is coming to visit next we r gonna have so much fun playing bingo and cleaning our dentures!
by targetforever January 29, 2011
Get the old sea dog mug.
Dog mannequins located in many Old Navy stores. Usually placed in front of a group of human mannequins. Unbeknownst to most people, The Great and Powerful Old Navy Dog Mannequin is our Holy Lord and Creator in disguise, pushed aside by other, more prevalent religions that favor humans more than animals. This shall all end soon. The Dog will Rise. The Dog will Rule.
The Old Navy Dog Mannequin is secretly Our Holy Lord! I'm not crazy!
by D O g ! ! ! December 11, 2017
Get the old navy dog mannequin mug.