Intercetor is milbemycin
Heartguard is ivermectin
These are very different chemicals
Livestock ivermectin can be used in dogs, and is commonly for certain conditions (like scabies and demodex)- but one has to be very confident with both MATH and breed sensitivities to use this safely. The dose...
I personally wouldn't do ivermectin in the water as it has a small margin between effective and toxic. Too much piperazine or fenbendazole is unlikely to make a chicken sick. Too much ivermectin if a chicken is drinking lots that day for some reason- and you could kill your bird(s). Also the...