Hi there
As a proud owner of two dogs (Elsa and Becky <3), there is some advice I would like to share with you.
First of all, fleas and ticks are very resilient and they love warm environments.
The feast of the blood of the host, and sometimes your dog will show signs of allergies by scratching, biting, and rubbing more often than usual in order to soothe the itching.
My personal recommendation is Bravecto for dogs oral flea and tick treatment for dogs.
Make sure to choose the right type depending on the weight and the age of your furry friend