愛犬 (aiken) means “pet dog” | MotiTan Japanese Dictionary

More examples

旅行中も、愛犬の写真を見ると安心します。ryo kō chū mo ai ken no sha shin o mi ru to an shin shi ma su

Even while traveling, looking at a photo of my pet dog makes me feel at ease.

Centers on a dog regarded by its owner as a cherished companion rather than merely an animal kept at home.

飼い犬kaiinu: A dog kept and cared for by a person as a household animal.

飼い主がかわいがっている犬。ka i nushi ga ka wa i ga tte i ru inu

愛犬 (aiken) is a Sino-Japanese compound of 愛 (ai, "love") and 犬 (ken, "dog"), presenting a pet dog as one cherished by its owner.

愛犬 (aiken) usually refers to a person's own cherished dog, so it sounds more personal than a general term for dogs.