Is it safe to give my dog Nexgard if Hartz flea treatment didn't work?

Question

My brother put Hartz topical flea treatment on my dog when I was out of town. I have an Rx for Nexgard, his fleas are horrible and he has a flea allergy. It's been 1 week and a half since the Hartz was applied. It is not doing anything for the flesh. Is it safe to give him his Nexgard now, or do I need to wait the full month since the Hartz was applied? Pet's info: Dog | Labrador Retriever | Male | unneutered | 7 years and 9 months old | 48 lbs

Andrea M. Brodie, DVM · Accepted Answer

You can give him the Nexgard now. There is more you can do: fleas only hop on the body of your pet when they want to feed, then they hop off again and stay in your pet's environment. So you need to treat all pets in the household as well as the environment (which contains the fleas, their eggs and larvae). Flea treatment:  1) Get some flea medication such as a Flea spray or a spot on from a pet shop or your veterinarian and apply monthly (Nexguard is great) 2) get flea powder, put some in your vacuum cleaner bag and vacuum your house and furniture and also non-carpeted areas frequently to remove flea larvae and eggs which live off house dust., Dispose of the bag in the trash outside. Hot-wash all the pet's bedding, If you do this diligently for a few months you will get rid of the fleas.

Is it safe to give my dog Nexgard if Hartz flea treatment didn't work?

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