Sorry about the delay....different time zone.
The safest and most effective flea treatments are the topical “spot-ons” but make sure you use one of the top brands. Some of the cheaper brands have been involved in problems with dogs.
Effective flea control must comprise two parts.
- Control of the adults on the pet.
- Control of the environmental stages.
So for the he adults use Revolution, Frontline, Advantage or Advocate. All very safe and will cause no problem with her skin issues. Frontline uses the oil layer in the skin to disperse and is best applied a couple of days before the bath (yes, before). That would be my choice for her being an oily dog. The other brands disperse differently and are best applied after the bath. Insecticides in the form of powders, shampoos, rinses and flea collars are nowhere near as effective and pose some risk to the health of your pet and yourself.
The environmental stages pose more problems. The egg and pupal stages of the flea are very resistant to insecticides until they hatch. Fortunately they can be effectively removed physically. This means thorough vacuuming of all floor surfaces including hard surfaces and all upholstery. Empty the vacuum cleaner straight away as the flea immatures will be in there. Wash all bedding. Make sure every place the pet frequents is attended to. This means kennels, under furniture, behind drapes and under beds. Wherever your dog or cat goes will be where the flea immatures are hiding and these immature stages account for 95% of the flea population.
Whereas insecticide sprays are of little value some of the flea bomb fogging agents can be very effective. These are the brands that contain insect growth retardants (IGR’s). These chemicals are extremely safe for our pets and for us. They work by breaking the life cycle of the immature fleas. They are best used after a thorough clean up.