i was wondering if anyone relates and knows why this happens.

when i hear, read, see etc things to do with the love of animals (mostly dogs) towards people, and the love of humans towards mostly dogs, i feel intensely sad. like watching a documentary and in it it shows a dog looking up at its human, who is also looking at it affectionately. i just feel really sad.
i don't know if it's because

- i know that the dogs are going to die much sooner than the humans
- it feels like the dogs are so perfect that they will never receive enough love in return
- it reminds me of losing my own dogs in the past

i find it really confusing and wonder if anyone else feels it