Reason for worry? 29 males - 28 females.

My fiancé (29M) and I (28F) are currently at an emotional impasse. When we began dating three years ago, he expressed a strong fondness for animals and was incredibly affectionate toward my special needs dog. I cherished his love for my dog, as I feel the same way. In return, I’ve treated his special needs cat as if she were my own, giving her equal care and affection. However, over the past year, I’ve noticed that his attitude toward my dog has changed. While he still feeds him and takes him outside, he no longer shows affection. When my dog approaches him for cuddles or pets, my fiancé often tries to push him away, prompting me to remind him, "He's excited to see you; could you please just give him a little pat on the head?" I feel like I shouldn't have to ask for basic kindness. Yesterday morning, we took my dog to the vet to address worsening skin issues, and my fiancé reacted with visible disgust and annoyance towards him. Afterward, I asked him about it and expressed how hurt I felt by his behavior. He admitted that the worsening condition grosses him out and that he thinks dogs are inherently less clean than cats. This revelation concerns me, as I never expected this to be an issue in our relationship. I adore all animals, but I primarily identify as a dog lover. Now, I can't shake the feeling that his initial affection for my dog was insincere. I still love my fiancé, but I'm worried about our future with dogs or other animals. Will he feel disgusted as they age or encounter issues? Am I overreacting and taking this too personally? I would appreciate any advice. Thank you!