Different types of dog toothbrushes include finger brushes, dual-ended brushes, and electric toothbrushes. Finger brushes are ideal for beginners and small dogs due to their ease of control. Dual-ended brushes have two sizes to accommodate both large and small breeds, making them versatile for households with multiple dogs. Electric toothbrushes can offer a thorough clean for any size dog but may require acclimation. Choose a toothbrush based on your dog's size and comfort level, ensuring the bristles are soft to avoid damaging their gums. Consult your veterinarian for specific recommendations tailored to your dog's breed and dental needs.