( CNN ) -- Two dogs set on fire in the past two weeks make for three canines burned and left to die in the Philadelphia area since June , according to animal welfare groups . The Pennsylvania Society for the Prevention of Cruelty to Animal reported a male pit bull puppy was brought to the city 's animal care center Thursday after the dog was discovered in the city 's West Oak Lane section . According to the PSPCA , the dog suffered extreme burns on his legs and back and possible smoke inhalation . After undergoing emergency surgery , the approximately 4-month-old puppy -- nicknamed Hercules by the staff -- is expected to survive , but the PSPCA said he was still in serious condition late Thursday . On June 25 , a female pit bull named Chloe was found in the city after she had been set on fire . She had burns all over her body , and later died of her injuries , the PSPCA said . `` This is an extremely troubling trend , '' said Marc Peralta , chief operating officer of the Pennsylvania SPCA . `` This is a sick and deplorable act , and something that wo n't be tolerated . Our humane law enforcement team will be investigating and will prosecute the person ( s ) responsible to the full extent of the law . '' In the city of Coatesville , about 40 miles outside of Philadelphia , firefighters responded to a trash fire early in the morning on June 9 . When they arrived , they discovered that the fire had engulfed a a 4-1/2 year old `` Yorkie-Poo '' mixed breed dog according to the Chester County SPCA . Investigators say the dog was asphyxiated and died before being set on fire . There is no direct evidence linking the three cases of animal cruelty , but authorities continue to investigate . The PSPCA will hold a rally against animal abuse on July 12 , and has established a $ 1,000 reward for information about Chloe 's case . Watch : 'Suck it ' carved into horse 's teeth .
On June 9 , firefighters found the burned body of mixed-breed dog . On June 25 , a female pit bull was found burned , and she later died . Thursday , a young male pit bull was brought in with severe burns and had surgery . The puppy -- called Hercules -- is in serious condition but expected to survive .