The penis of a canine has many differences when compared to a human penis.

When docile, the penis remains in the dog's sheath to keep it sterile, moist, and protected. The penis usually leaves its sheath when the canine is aroused (not to be confused with erect) or when he is thrusting.

The penis itself is usually red or pink in color and is composed of a membrane layer that is similar to what's on the inside of your mouth. It does not become 'erect' until after successful penetration. Instead, the stud's penis maintains its shape with a bone called the baculum.

When finally "erect", a thick "knot" at the end of the penis fills with blood and swells several times its flaccid size. This is called the Bulbus Glandis, and it keeps the male dog tied -- or knotted -- to the female dog, which prevents any reproductive liquids from leaking, thus improving the chances of a large or successful litter.

Finally, a male dog's penis does not feel pleasure in the same way that a human penis would. Where stroking of human's penis (i.e. by a hand, vagina, mouth, etc.) brings pleasure to the man, the opposite is true for a canine, as it'd only cause discomfort and irritation if prolonged. Instead, the stud's penis responds mostly to pressure behind its bulbus glandis, which insures that the knot stays 'erect' when the female's vulva is clenching behind it.
Uneducated friend: Haha, look at Spike's Red Rocket! My dog has a boner!

Educated friend: That's just his canine penis being forced out of its sheath by his baculum because he's sitting down.

Uneducated friend: Dude, how do you even know all that? You must be some zoo weirdo.

Educated friend: Please bury yourself in a hole and take your prejudice with you.

Uneducated friend: You're just offended because you're a zoophile!

Educated friend: It's idiots like you that keep science and education from advancing.
by ShockingTruth September 23, 2013
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The part of your mind that makes you feel guilty for shouting at the dog.
This is a classic example of canine-conscience;

Guy-You naughty boy!!! You've P**sed all over the bed. Hmm was I too hard on him there?
by KEJIAN February 26, 2009
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While standing at the edge of the bed, giving it to your wife, the family pooch pulls a sneak attack from behind and joins the party by giving you a doggy rim job. Surprisingly, you like it.
Last night I was fucking like Ron Jeremy, when FIDO entered the threesome and put me over the top by throwing down the CANINE SHOCKER.
by Mikeytee September 8, 2011
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Forcing somone into submission and to take on the roll of a canine or dog; living in a cage, wearing a collar and usually having their hands immobilizedwith special locking gloves that force the hands into fists so that they look like paws. Prevalent practice in the BDSM community.
Travis was forced into Canine Submission, his master makes him wear a collar and wear a gag in his mouth because dogs can't talk, I hear he even eats out of a dog dish and walks on all fours.
by Matthew L. Schwartz March 8, 2005
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"sniff, lick, piss, shit" - These are the manditory functions of a large male dog while on a walk. The Canine Combo is performing these functions on the ol' bitch.
She was dirty in bed, so I decided to give her the old canine combo.
by Sir Buster B. Fuffleton September 7, 2006
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Poetry about SA, failing to protect yourself or others, and abuse that’s typically depicted with dogs and how they bark and bite
“I bare my teeth to try to stop you. I was uncomfortable that you were hurting me. But I never wanted to hurt you So I let you touch me” -Canine poetry
by Ballincat434343 October 8, 2023
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Based on a man's age, this scale classifies men (who prey on younger women for their sexual appetite) as canines.

The scale is as follows:

Age 0-12: Pup
Age 13-17: Weasel
Age 18-21: Dingo
Age 22-29: Jackal
Age 30-39: Coyote
Age 40-49: Husky
Age 50-59: Silver Fox
Age 60-68: Wolf
Age 69: Pooch / Bush Dog
Age 70-79: Arctic Wolf
Age 80-89: Hyena
Age 90-99: Badger
Age 100+: Old Dog
Zac Efron is a Jackal on the Canine Scale, but Charlie Hunnam, Gerard Butler, George Clooney, and Bruce Willis are classified as Coyote, Husky, Silver Fox, and Wolf, respectively.
by danthecolombian December 7, 2016
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