When I was pregnant with my second, my cat Magic came down with a horrible infection that we could not cure. He peed and bled all over the house. I of corse was not supposed to be around that, but tried to keep him as long as I could. He then started to show signs of pain, so I had him put to sleep.
I also had a dog who had to be given away while I was in the hospital giving birth to my second.
He started getting very aggessive, I couldn't keep him with a toddler and a new born.....
I still miss them both.
I still have one cat, he does his own thing and never bothers anyone...other than that I now have fish...thinking about a box turtle though.
Sorry to hear of your loss, sometimes, I had to learn, there is nothing else you can do.