Is this a bug or something? I did go into peaceful mode for a while in order to do a big construction job without annoyances (creepers) but I didn't think that effected animals. Now I can traverse the whole freaking world and not find a single cow, sheep, or pig. --- I have to make a sig or nobody reads the last line of my message.
No problem, although only 19 dogs does sound rather low for a limit. I recall having around 50 wolves when they were first introduced in the PC version before they stopped spawning. I guess they decreased the number for the Xbox.