First time shown on screen the dog is fine. Around 14 minutes, cop is on the phone with Mike telling him to go over. Then an American Pitbull Terrier is shown inside a car. Stop watching then to avoid seeing the dog being shot several times. The dog is also shown when the car door is opened.
Episode 5 a dog is neutered, after they take Jimenez in. You see the dog get neutered the same time Jimenez is getting metaphorically neutered, going back into prison. It is graphic but there is no blood.
S1E3- After the prison killing, Mike is standing in a field where the boy from salirse in the episode is going to be buried. He looks down and sees a dung beetle getting attacked by ants. After his conversation with the grave diggers he sees the beetle has been killed by the ants.
S1E1- The 2nd time the mother teaches the women at the prison, she tells a story about dogs dying (like they said above). Skip the entire conversation- you can start watching again when she’s interrupted and asked to come outside.
A dog fighting ring is busted by police. No fighting takes place, but a dog is removed, sedated and neutered by a vet and the process is shown graphically.
Season 1 Episode 1 - Unfortunately there’s a graphic mostly true story about the Choctaws dogs drowning. Skipping the story doesn’t have a direct impact on the plot.