Indoors it can be housed in vivaria from 150cm long by 60cm deep by 60cm high, as a minimum for an adult pair. The sides of the cage should be opaque except for the front glass to give the dragon some sense of security. The dragon is likely to be very nervous and damage itself in cages made entirely of glass.
According to this model, a Bulldog will age an average of 13 years per human year whereas a Miniature Dachshund only ages about four years. Unfortunately they only calculated the 3+ year ratio for a handful of dog breeds, but this means that my 1-year old Border Collie, Scuttle, is about 10.5 in human years!
The following table summarizes how to convert horse years to human years, and is based on the Equine-Human Maturity Evaluation. The above table is an average of different horse breeds, based on a well-kept domestic horse. It uses an average horse lifespan of 24 years and an average human lifespan of 70 years. Wild horses and poorly kept horses have a much shorter lifespan, while some breeds (e.g. Arabian and many pony breeds) have a longer lifespan. To allow for different breed lifespans, simply use the following calculator: