Just One Flea Can Be a Sign of a Problem As few as 20 fleas might mean your pet is infested, while the most could be between 200 to 300. Ignoring a few fleas can quickly lead to an infestation on your dog and in your home,2 because two adult fleas could lead to hundreds of eggs and pupae.
Is one flea treatment enough?
A single application of any product is not sufficient. Not only can fleas make your pet uncomfortable, sore and itchy - they also pose a serious health risk. Flea infestations can cause anaemia due to the amount of blood a cat can lose to the parasites, and it can be fatal - especially in kittens.