Here's why:
* Different active ingredients: Cat flea medications often contain different active ingredients than dog flea medications. These ingredients can be toxic to dogs and can cause serious side effects.
* Dosage differences: Even if the active ingredients are similar, the dosage needed for cats and dogs can be very different. Giving a dog too much of a cat flea medication can be dangerous.
* Skin absorption: Cats absorb flea medications through their skin more readily than dogs. This means a dog might absorb a larger amount of the medication, increasing the risk of toxicity.
It's essential to use flea medication specifically designed for dogs. Always check with your veterinarian to choose the best flea control for your dog, taking into account their size, age, and any health conditions they might have.