Four firefighters were hospitalized Monday morning after rescuing a man and his dog from the frigid Sheldrake Lake in Larchmont.

Authorities say an unidentified man was walking his dog, Roxy, on the trail that surrounds the Sheldrake Lake reservoir around 9 a.m. The dog was not on a leash, officials say, and ran for a volleyball that sat on the edge of a patch of ice on the lake. The dog fell through the ice and the owner called 911 on his cell phone before going in after his dog.

The Mamaroneck Fire Department arrived soon after and was able to rescue both the man and his dog. Authorities estimate the water was between 30 and 40 degrees.

?It?s a very dangerous time of year,? Mamaroneck Fire Chief Brendan Collins says. ?If you walk on this ice, it?s more than likely that you will fall through.?

The man was also hospitalized and Roxy was taken to Village Animal Hospital. Officials say Roxy?s body temperature dropped 20 degrees.

The four firefighters and the dog owner were released from the hospital Monday afternoon.