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There are only 3 ways to solve stray dog problems:
1. To kill or remove every single fertile bitch.
2. To remove the food source, i.e. somehow prevent animals lovers feeding unsupervised dogs
and remove all rubbish from the streets so that the dogs starve to death.
3. Neuter and Return
Extermination campaigns, for example the indiscriminate poisoning or shooting of dogs at night irrespective of whether they are neutered and vaccinated or indeed pets with owners, have never succeeded anywhere in the world.
‘Neuter and Return’, the policy advocated by the World Health Organisation and the World Society for the Protection of Animals, solves the problem permanently, although dogs have to be tolerated on the streets for 5-8 years for it to succeed. Providing it is implemented to the edge of the urban area it is however a permanent and humane solution.
Stray dog populations anywhere depend solely on the amount of food available. Nature adjusts the population to the carrying capacity of the territory. If just one fertile female escapes being killed or captured she can breed up to 67,000 offspring in 6 years. That is why killing dogs can never succeed unless every single female is exterminated. That is why Turkish streets are still full of dogs.
If however the carrying capacity of an area is filled with sterile animals the population will gradually die out, providing no fertile dogs can infiltrate from surrounding areas and providing freshly abandoned dogs are collected by dog wardens, police and residents (as in developed countries).
This way, although there may seem to be a lot of dogs on the streets to start with, within a few years the street dog population could be drastically reduced to as much as 80% less.
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