Dogs Trust Evesham has issued the warning as the UK faces weather and flood warnings.
The charity says that while many dogs love to swim, the freezing temperatures and heavy rainfall mean that their usual bathing spots may be frozen over or flooded.
This could be dangerous for both dogs and their owners.
Ice may not be thick enough to support a dog’s weight, and they could fall through into the freezing water underneath.
Flood water can contain toxins, which could be dangerous to pets if swallowed, and submerged hazards, such as broken glass, may be lurking under the water.
The charity strongly advises that if a dog does fall through ice or enter flood water, owners should never be tempted to go in after them.
The effects of cold-water shock on people can be fatal, causing heart attacks and increasing the chance of inhaling water directly into the lungs.
Jenna Kiddie, head of canine behaviour at the charity, said: “Over the last few days, we have experienced all kinds of winter weather across the UK, from heavy rain and winds to snow and ice.
“While a frozen pond or flooded field might provide tempting opportunities for your dog to explore, ice can be incredibly dangerous for both you and your dog.
“If you are walking your dog anywhere near frozen lakes or floodwater, keep them on a lead.
“If your dog does go into the water, don’t follow them as this could lead to you requiring an emergency rescue, and could cause you serious harm.
“In the event of an emergency, call 999.”
The charity has also published some guidance to help ensure dogs remain healthy and happy.
This includes keeping dogs warm, wiping their legs, feet and stomach after a walk, avoiding antifreeze, increasing visibility, checking leads, and considering indoor games.
For further information on keeping your dog safe and happy over the winter, visit: https://www.dogstrust.org.uk/dog-advice/life-with-your-dog/seasonal/cold-weather-advice.