The correct Cephalexin dosage for dogs is based on each dog's individual body weight, says Apex Laboratories. The source explains that Cephalexin should be prescribed at 15 mg for each kilogram of body weight, or about 75 mg per 10 pounds of bodyweight. Cephalexin should be given to dogs three times each day.
Genital and urinary tract infections should be treated with Cephalexin for at least one full week, says Apex Laboratories. The source notes that Cephalexin treatment for all canine infections should continue for at least two days after the dog stops showing symptoms of the initial infection.
Typical side effects include nausea, vomiting and diarrhea, but Apex Laboratories explains that these side effects are rare. If they do occur, they are usually mild. Signs of an allergic reaction include scratching, swelling and rashes, says the Daily Puppy. The site explains that severe allergic reactions may cause seizures or shock. Apex Laboratories notes that humans are more likely to experience side effects and adverse reactions than dogs.
Owners should never give dogs multiple Cephalexin doses at once. The Daily Puppy warns that giving dogs multiple doses at the same time can lead to Cephalexin overdose. The signs of Cephalexin overdose include weakness, muscle spasms and pale gums, according to the Daily Puppy.