Sergey Kovalevpled guilty Friday in a criminal case stemming from an alleged violent incident with a woman and dog in 2018 … and the boxing star will now have to spend the next 3 years on probation, 360APROKO Sports has learned.

Kovalev was accused of punching a woman in Big Bear, Calif. back in June ’18 … after the alleged victim claimed she turned down his sexual advances.

The woman, Jamie Frontz, said the two had met at a boxing gym-opening party … and began kissing at her rental cabin shortly after.

But, she says when she pulled away from the fighter after feeling like he was too aggressive … he became violent.

Frontz says Kovalev kicked her dog … and then later socked her in the face.

In an interview with 360APROKO Sports about the incident, Frontz claimed the punch caused a broken nose, a concussion and facial lacerations.

Kovalev was eventually arrested and hit with a felony assault charge … and faced YEARS behind bars.

But, according to court docs, Kovalev cut a deal with prosecutors Friday … and got the felony charge dropped.

In exchange, 37-year-old Sergey pled guilty to misdemeanor fighting/noise/offensive words … and was sentenced to 3 years probation.

Kovalev was also ordered to serve a 2-day jail sentence … but he received credit for time served and won’t spend any more time behind bars.

Court docs also show Kovalev must attend/complete an anger management program, as well as pay $220 in court fees.

We’ve reached out to the boxer’s attorney for comment … but, so far, no word back yet.

Frontz’s civil case against Kovalev, meanwhile, appears to be ongoing. She sued the former champ seeking the $650,000 she claims he agreed to pay her in the wake of the incident.