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If you could train it to happen reliably, that would definitely be a service animal behavior. As far as I know, service animals generally have a little more training for their jobs than just an inherent aptitude - a natural inclination to the behavior helps, but it’s generally shaped and perfected from there. Legally, only dogs and horses can have public access (I’m glad you wouldn’t want to take him - it’s great you’re aware of his needs) but he could certainly be an at-home service animal that way.
That’s a really great alert system to have, and it’s really cool you’ve got a pet who does it for you.

If you could train it to happen reliably, that would definitely be a service animal behavior. As far as I know, service animals generally have a little more training for their jobs than just an inherent aptitude - a natural inclination to the behavior helps, but it’s generally shaped and perfected from there. Legally, only dogs and horses can have public access (I’m glad you wouldn’t want to take him - it’s great you’re aware of his needs) but he could certainly be an at-home service animal that way.
That’s a really great alert system to have, and it’s really cool you’ve got a pet who does it for you.
