I agree with a lot of the answerers here. My experience: I have a 1 1/2 year-old dog. got her at 8 weeks old. as a puppy i just about got her every single vaccine. . .the combos, rabies, lyme, bordatella, etc. but after asking similar questions about vaccines and hearing about over-vaccination i have only gotten my dog her adult rabies shot because it's required. i haven't done an adult booster vaccine or anything because all the vaccines she had as a puppy are most likely still effective! i plan on doing an adult booster next year and probably never again after that. sometimes homeopathic medicine sounds a little kooky, but some things really work! like @shelter puppies rule, i use essential oils to control fleas and ticks and my dog has not had fleas/ticks at all! i've been using the oils as well as brewer's yeast tablets since april with excellent results. and i live and hike a lot in central kentucky, which transforms into a humid, bug-infested jungle in the summer LOL. take a look at the links other answerers provided and do what you feel is best.