1 Chair knee extension: Sitting in a chair, rest your foot on another chair so the knee is slightly raised. 2  Gently push the raised knee toward the floor using only leg muscles. 3  Hold for 5 - 10 seconds and release. 4  Repeat 5 times on each leg.
Hematemesis in Cats. Hematemesis, or the vomiting of blood, can affect a wide range of systems, depending on the source. The gastrointestinal system may be affected due to trauma, ulcer, inflammation, or the presence of a foreign object.
Sign of Hairballs. Believe it or not, throwing up foam could be due to hairballs. Cats get hairballs when they swallow hairs during their grooming duties. According to Diane Stein, author of The Natural Remedy Book for Dogs and Cats, if you notice your cat vomiting foam that doesn't have any hair in it, hairballs could indeed be the culprit.