Yes. See a vet immediately.
Yes, suddenly is a good transition word for a situation that occurs quickly or without being expected. Here are some examples. "Suddenly, the wind started howling and lightning could be seen on the horizon." Usually, one would expect there to be some preceding stories to set up whatever was about to suddenly happen.
1. The Howling in 1981 2. Howling II...your sister is a werewolf in 1985 3. Howling III - The Marsupials in 1987 4. Howling IV -The Original Nightmare in 1988 5. Howling V - The Rebirth in 1989 6. Howling VI - The Freaks in 1991 7. The Howling Reborn in 2011
A howling sound
Howling Hex was created in 2003.
The Howling Miller was created in 1981.
Howling Bells was created in 2004.
The Howling Stones was created in 1997.
The Howling was released on 04/10/1981.
The neighbor's dogs were howling all night.
The Production Budget for The Howling was $1,000,000.
The Howling Miller has 236 pages.
The Howling Stones has 336 pages.