Do dogs have to get stuck together to become pregnant?

My question is does a male and female have to get stuck together to get pregnant?

uhm, no?

The canine male genital apparatus is made up of the testicles in the scrotum and the pen*s that is covered by a sheath of skin and only becomes visible when erect. When copulating the dog's pen*s engorges and this is why male and female dogs can be seen stand back to back after the act of copulation. Do not try to force them apart as this can cause internal injury to both sexes. Once the males pen*s losses its rigidity they will separate on their own.

The female canine's genital apparatus consists primarily of the ovaries, the uterus and the vagina

I dont think soo

Absolutely not: Only when the 'sperm meets egg'. And to get stuck the pen*s has to engorge -starting about one quarter away from the base of the pen*s on up near the tip. After the penetration the pen*s engorges until the part of the pen*s that’s pass the vagina entrance threshold continues to swell up, locking itself behind the smaller vagina opening. If you ever have the chance, take a look at how swollen the pen*s is three quarters of the length, and then gets smaller in girth or width right before the base.