Why not try mixing some Guinea Fowl in?? Great for snakes, foxes, etc. The breed Maremma sheepdog is the standard dog they use.
http://www.gumtree.com.au/s-ad/southern-downs/dogs-puppies/maremma-livestock-guardian-dog/1091469351
On the maggots, sheep powder for fly strike does an awesome for infestations even deep wounds, its a pesticide, anti bacterial and has antibiotic properties. You can use it on loads f different animals. Don't take any eggs for a coupla weeks after treatment (check with holding period on label)...
Birds are related to reptiles. feathers are scale extensions so I don't rule it out that environmental factors such as temp humidity or diet can affect the sex of progeny. :)