Service animals are individually trained to perform a specific task. I think the revisions that were planned for the ADA last January were put on hold unfortunately. Those revisions would have stated clearly that "farm animals and exotic animals" cannot be trained as service animals as well as that "therapy" AKA "comfort" animals are NOT service animals and thus not protected under the ADA. There were some good points to the revisions & clarifications. If anyone knows for sure whether or not any of the law was changed please post with links.
I have a great deal of experience with service animals as a rental housing manager and manager of commercial and public buildings.
I do not often specificaly tell people they are wrong on facts on this board, but in this case I will.
-The regulatory agencies that enforce anti-discrimination laws do not hold that proof of training is a prerequisite to an animal qualifing and service animal, only that a health care provider certify that an individual qualifies per statue as disabled, and describes a particular type of animal as needed in connection with that remedy.
-Animals (sometimes called comfort animals)prescribed by health care providers for those with mental disablities (including and ranging upwards from simple depression)are indeed legally defined as service animals.
Anyone subject to the ADA or Fair Housing Amendments Act that ignnore these principles is at legal jeopardy, as experts in the field have clearly stated at seminars that I have attended.
I am not a lawyer, so this is not legal advice, but an experienced layman's advice.