Popchik is in scenes of peril throughout the book but is ultimately fine in the end.
"off-screen" an unrelated dog is said to have passed away but this is quickly moved past.
Not in these exact words, but in a scene where a character mentions what the main character would say while drunk it mentions that he would say he wanted to die and lay in the middle of the road trying to get hit
Theo's father abandoned him and his mother, mentioned early on. (Comes back for him later in the book) Boris' father leaves Boris on his own most of the time.
15 y/o Boris talks about wanting to sleep with Theo's dads girlfriend, Xandra, who is an adult. Theo goes on to mention how the police could take her away for statutory rape.
"off-screen" an unrelated dog is said to have passed away but this is quickly moved past.