There is no need to worry about any type of issues from your dog eating roaches that have been in contact with Advion Roach Bait Gel. There is only enough insecticide in these products to kill a roach, not enough to have any effect on a mammal.
Yes, it is normal for some roaches to not go directly to a bait such as Advion Roach Bait Gel and eat it. It can often be that they are feeding on some that has been brought back to the colony already, feeding on the feces of the adults, or feeding on other dead roaches. They also could be looking for water or other materials and not currently foraging for the bait. Depending on the size of the colony, it can take at least several weeks to a month or so to eliminate the entire population. If you have used the same bait for several months, than we would recommend rotating with a different bait to prevent bait aversion. Good rotation choices would include Maxforce FC Magnum or Maxforce Impact Roach Bait Gel.
"Potential Health Effects
Based on animal testing, no biologically significant effects are expected from skin or eye contact or by ingestion."
You should still read and follow the product label which recommends that you use the roach bait gel in places that will be inaccessible to your pet.
It is always better to know exactly what you are dealing with, however the Advion Roach Gel is labeled for use on all roaches. That being said, it is really good for German Roaches which are the most common indoor infesting roaches, but it may not be the best thing for other types like American roaches that come from outside.
Typically with that small of an amount there is no need for worry. More than 90% of the baits are made up of food based ingredients which is what attracts the roaches to it to take back to the colony. If you are concerned you can monitor your dogs and contact Syngenta directly regarding any side effects they may have from what little they ingested. Also, keep in mind that any place you are putting this bait gel should be in an area the pets cannot get to anyways, so you may not want to put the bait in the same places again if the pets have easy access to those areas. You can reach Syngenta at 302-425-2000.
The Advion Roach Bait Gel should be applied once every two weeks (cleaning up old bait placements prior to new applications) to keep the roaches attracted to the product. The Advion Roach Bait Gel has a shelf life of one year from the date of purchase if stored away from extreme temperatures.