The 30-year-old took to Instagram on Thursday to share a photograph of her pet, Finley Cooper Seyfried, celebrating his seventh birthday, reports dailymail.co.uk.

The image featured the dog wearing a party hat, with a balloon behind him and a cake decorated with birthday candles.

"Happy 7th, best friend," Seyfried captioned the image.

Amanda and her dog -- who has his own Instagram account -- are also training to take part in the Strut Your Mutt campaign which sees pet lovers partake in a fundraising walk to raise awareness about the killing of pets in animal shelters in America. 

The walk is typically between one and two miles long, and takes place in cities all over America, with Amanda and Finley taking part in the Los Angeles walk on October 22.