Las Vegas, Nevada - Tennis dream couple Steffi Graf and Andre Agassi are in trouble. The two are currently in a feud with their neighbors – over a dog.

Steffi Graf (51) and Andre Agassi (51) have shared their home with Blue the Great Dane for more than five years now.

In February 2016, the animal joined the family of ex-professional athletes and has been spoiled rotten ever since.

Agassi in particular seems to adore the four-legged friend, and regularly shares snapshots on his Instagram channel of himself and Blue cuddling on the couch at home.

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But now the good boy may be giving his owners more stress than joy, according to the German network RTL.

Blue is said to have attacked and injured one of the family's neighbors while out for a walk.

The report said the person suffered bite wounds severe enough to require medical attention.

The woman is now demanding compensation of $15,000. If Graf and Agassi do not pay the sum, there could be a court hearing with harsher consequences.

In the worst case, the court could order the dog to be put down – which would be really tragic for the couple.

Steffi Graf and Andre Agassi have been married since 2001 and have said that they didn't want to force their children into the professional tennis life.

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Their son Jaden (19) was born the year they married. Their daughter Jaz Elle (17) was born in 2003.

The couple's kids have more or less grown up, and it seems the mostly empty-nesters were happy to have someone to dote over and take with them on errands.

Just recently, Agassi shared a photo of himself and his wife, explaining that the two have been quite lonely since their kids have become more independent and are "trying to cope with life."