Thanks for the input so far - greatly appreciated!
To follow up on some questions:
- both cats are indoor only
- The little one actual just had her annual checkup a week or two before all this started happening. Everything was perfect. The big one has an appointment in a week or so.
- no...
2 cats - both the same age (about 2.5 years old), but we adopted Cat1 as a kitten, and Cat2 at about a year old.
Cat 1 is a large strong male (15-20 pound range), neuteured.
Cat 2 is a tiny female (under 10 pounds), spayed.
So for the last 1.5 years, these 2 cats have lived together and we...