I'm not fans of the A's, but depending on how old the animals were when they got them, 4 pets in 15 years may not be that many. I've lost 3 in 16 years. I had 2 dogs that I got together as puppies. One lived to be 14, the other 16. I also got a cat who was 7 (he came with my 2nd husband). Unfortunately, he became ill and died when he was 9. I actually lost all 3 of them within 5 years.
Right now I have a 7yo dog, a 3 yo dog, an 8 yo cat, and two 12 yo cats (brother and sister). If the 2 older cats stay healthy and live another 6 years, that will make my oldest dog 13. Unfortunately, I could be in the position of losing all three of them at the same time, and still having geriatric cat and a geriatric dog.