Taylor Lautner is mourning the death of his dog.

The 'Twilight' star took to Instagram to reveal his pooch, who he has had for 13 years, had sadly passed away.

He wrote on the photo sharing site: ''Roxy, my family surprised me with you on the set of sharkboy and lavagirl in 2004.

''You have brought so much joy into my life for the past 13 1/2 years. I'll miss you every day but I'll take those memories with me everywhere I go. I love you. (sic)''

It has been a tough time for Taylor, after he recently split from Billie Lourd after eight months together.

A source said at the time: ''They aren't together anymore but they are still friendly. She's really focused on her work right now.''

The 25-year-old actor had been there for Billie after the tragic deaths of her mother Carrie Fisher and her grandmother Debbie Reynolds, who passed away in December 2016 just a day apart from each other.

Carrie's brother Todd had previously praised Taylor for supporting Billie.

He said: ''The truth of the matter is, the guy is pretty spectacular. He's a really deep person, and he has supported [Billie] amazingly. He's stepped up and acted like a husband would act. Not that that's what's going on, but it's just an amazing support system for her, and I'm glad he's in her life. That's not easy for me to say, if you think about it!

''As any uncle, you're suspicious of the guy hanging around your niece. She's cute and all that. She's had other boyfriends, good boyfriends, but I'm certainly going to give that guy the extra look-over. I don't give a s**t what his background is.''