Swimming. Not all dogs are great swimmers, and even a great swimmer can get caught in an undertow. To be on the safe side, give your dog a life preserver, available at pet supply stores, especially if you plan to take your dog on a boat.
Bugs. Mosquitoes can carry a parasite that infects your dog with heartworm disease. Take your dog to your vet each year before mosquito season begins, and have him checked for heartworm and other internal parasites. Your vet can prescribe a heartworm prevention program.
Fleas and ticks are more plentiful in the summer. Groom your dog regularly and look carefully for ticks and fleas. Your vet can prescribe medication to prevent flea and tick infestation, or you can purchase special preventive shampoos, dips, and collars.
Lawn and garden. Some plants are hazardous if dogs munch on them. Plan a "pet-safe" garden or do not allow your dog in your garden.
Insecticides, herbicides, and fertilizers can be dangerous or poisonous to pets. Residue accumulates on a dog's paws when she runs on a treated area; she could become ill if she licks the chemicals off her paws. Freshly-sprayed lawns are a particular concern if your dog is fond of eating grass.
Hot pavement or sand can cause footpad problems. If the surface is too hot for your bare feet (you can check the pavement with your hand), it's too hot for your dog's.
To remove sticky tar, rub the dog's footpads with petroleum jelly, wash with a mild soap and water, and rinse well. Do not use kerosene or turpentine; they irritate the skin and can be toxic.
Antifreeze. In warm weather, cars can overheat and leak antifreeze. This substance is highly toxic to dogs; take your dog to the vet immediately if you suspect that she has ingested antifreeze. Store your antifreeze in a locked cabinet or on a high shelf, and dispose of spills promptly.