Do Chihuahua have any health checks, if so what are they.

I expect the bred clubs can advise. 

There are certainly things that they are more likely to get and for which there are no control schemes and a good knowledge of the bloodlines should help you avoid. 

So study into the breeds history.  Published matter from the clubs can help with such research as often articles about these problems will be written from time to time.

It is a good idea to buy about 20 years worth of breed periodicals to start with, to help with research as well as borrow from your breed mentors.

Often it will be found that things go in cycles with a problem appearing and then disappearing as breeders try to breed it out, and then it reappears again.

I always get my vet to check eyes, heart and patellas before I decide to breed.  And I don't like dogs with bad mouths!

If you are going to purchase a chihuahua puppy you shouldn't get one until it is at least 12 weeks old and had both vaccinations. Make sure you get one from a breeder that knows all about the breed. There aren't any specific health checks but the puppy should have been checked by the vet when it had it's vaccinations. The main problem is patella's, but just ask the breeder if there is a history of patella and you should be fine. Hope you find this info helpful.

What about Open fontanelle's, Water on the Brain etc?  these are all things that can crop up need to be avoided by pedigree research, so very important to go for a knowledgeable dedicated breeder.