Dogs are mammals and so have four-chambered hearts.
four.
4
Maybe your mean four chambers?
some only have three chambers
i think it is 4 chambers in the Human Heart
Agnatha, such as lampreys and hagfish, have a two-chambered heart. The heart consists of an atrium and a ventricle, which pump blood through the circulatory system.
some only have three chambers
4 heart chambers
No. The lower chambers of the heart are called the ventricles. The atria are the top chambers of the heart.
Their are 2 heart chambers.
There are 4 chambers to the heart.
The bird's heart has 4 chambers.