Well, it depends on how much chocolate was in the tub. Your dog might be fine or he/she might get sick to the stomach. Most likely your dog won't die because he/she would have to consume a VERY large amount for that to happen.
To control or break the epidemiological triangle of malaria, 'the biological vector can be controlled through chemical larvicides', Chemical larvicides are chemicals that kill the larva mostly used for killing mosquitoes and here in case of malaria too vector is mosquito so it can be controlled by chemical larvicides.
The relocation of village to nearby village is somehow a hectic work, but could be done if no other repellent of malaria is available.
'Instructing the residents on personal protective measures, such as bed netting and use of DEET repellent' is also an effective measure to break this epidemiological triangle of malaria. Apply repellents on skin and use of netted beds keep the vectors away for as much time as possible, so it would prove to be effective.
