Just bought a 4 week old minature Chihuahua off the internet that was covered in fleas and had flea nests on her. We washed it with Dawn and combed out the fleas ( it looked like we got them all). But how do we keep the fleas off her and potty train her to go outside without getting more fleas on her? Are there any homemade remedies to keep fleas off such a young puppy (4wks old)???