The man had become trapped on ice while trying to rescue his dog from the lake at Battersea Park at 11.20am on January 11.
Firefighters deployed an inflatable rescue boat to bring both the man and the dog to safety, where they were treated at the scene.
In a separate incident, another dog was rescued at about 1pm after being stuck on the same lake.
A spokesperson for London Fire Brigade said: “These incidents highlight just how important it is to keep dogs away from frozen ponds, lakes or rivers which can pose a danger.
“It’s best to walk dogs away from frozen water or keep them on the lead if it’s unavoidable. If your dog ventures onto the ice, never follow them onto it, instead call them to come back to you right away, but if they get stuck call fire and rescue services for help.
“Owners should never try to risk rescuing their pet as they could get themselves into a dangerous situation.
“Even if ice appears thick from the bank, it becomes thinner very quickly. Keep away from the edge of open water, especially slippery banks.
“If you fall in, the temperature of icy water is cold enough to take your breath away, which can easily lead to panic and drowning.
“The coldness can make your arms and legs numb which means you can’t control them and can’t swim. It can lead to hypothermia – a serious reduction in your body temperature – which can cause heart failure.
“This happens even to the strongest swimmers.”
Two fire rescue units from Lambeth, Battersea, Chelsea, Edmonton, and Bethnal Green fire stations attended the scene.
Both incidents were over by 1.15pm.
