Source: AP Health

Dog trainers and Veterinary experts are encouraging owners to teach dogs to avoid venomous snakes, particularly in regions where rattlesnakes are common. The ASPCA estimates that up to 150,000 dogs are bitten by venomous snakes each year in the United States. In Arizona alone, emergency veterinarians treat several rattlesnake bite cases daily. Many trainers use electronic collars during controlled avoidance sessions, allowing dogs to associate the sight, sound, and scent of snakes with an unpleasant experience. 
While some animal welfare organizations question the use of electronic collars, the ASPCA says they can be effective when used properly by experienced trainers. Researchers at the University of Arizona are studying the effectiveness of various snake avoidance methods. Experts also recommend keeping dogs leashed on trails, clearing yards of snake friendly hiding places, learning about local snake species, and seeking immediate emergency Veterinary care if a dog is bitten, as prompt treatment greatly improves survival.