Перевести одно предложение на : the two-year-old dog is believed to have been put off grabbing suspect's arms after an ulcer in its palate made it painful for him to clamp its jaws.

Болезненная язва в пасти пса, мешавшая ему сжимать челюсти, очевидно, отбила у него желание хватать подозреваемого за руки.