Based on your personal experience with Asier as a caregiver for your pets throughout their entire lives, I can recommend him as a responsible and trustworthy caregiver. The fact that he has taken care of your two dogs and cat for such a long time is a testament to his dedication and love for animals. It is important to note that responsibility and commitment are two essential qualities in any person who cares for pets, and in Asier's case, he seems to have demonstrated both at all times. His previous experience and meticulous attention to your pets' needs suggest that he is a reliable and capable caregiver. In summary, I would recommend Asier as a responsible and trustworthy pet caregiver, and I would not hesitate to entrust him with the care of my own animals if needed.