As with most issues that can affect senior Chihuahua dogs, this is something that often comes on slowly and it is only when it is in the moderate to severe stages that many owners will notice that something is wrong. It is common for an older dog to start to have trouble with his/her vision. While some issues can be corrected, older age brings about eye issues of wear and tear. Other age related issues are cataracts and retinal degeneration.
Many older Chihuahuas experience a clouding of the eye lens. It is a gradual process that can begin early at the age of 7 and then gradually worsen as the dog ages. Often, it will not be noticeable until the age
of 10 or 11 years old. This age related clouding is referred to as nuclear sclerosis and for some dogs it will develop into a cataract.
While twice a year wellness checks will find any clouding, if found, a Chihuahua should be examined by a veterinary ophthalmologist who will keep an eye on things. If this does become severe and moderately to severely affects the ability to see, surgery can correct this.
Other possible issues are glaucoma and retinal disease. Other, expected changes that have no solid treatment is a general worsening of vision. A senior Chihuahua may not be able to see as far, for example.
When a dog ages and may have trouble seeing, it is always recommended to keep the layout of the house the same - do not rearrange furniture if at all possible. Keep floor clutter to a minimum. In addition, for dogs with eye vision issues, do realize that exposure to a new environment or situation may cause stress.