Unfortunately, because WhatsApp doesn’t actually have stickers, you can’t use animated Stickers in WhatsApp. You can, however, send short video clips.

Emojidom (Android) Smileys and Memes for Chat (Android) Stickers Free (iOS) ChatStickerz - Funny Emoji Stickers (iOS)

Emojidom - Emojidom contains a keyboard and text screen. Type out your message and include any of the stickers that you want. Tap the “Share” button when you are finished and then select “WhatsApp”. You can also tap the “Attach” button in WhatsApp and choose Emojidom as your album to select any of its stickers. Smileys and Memes for Chat - Tap the sticker you want to send to WhatsApp. Once the sticker has been selected, tap “WhatsApp” in the lower-right corner. Make any edits you’d like, then tap the “Done” button. WhatsApp will open, and you can select the conversation you want to add it to. Stickers Free - Tap the sticker that you want to add to your WhatsApp conversation. Select “WhatsApp” from the list of messaging apps. Tap “Open in WhatsApp” to launch the WhatsApp app. Select the conversation that you want to paste the sticker into. ChatStickerz - Find and tap the sticker that you want to add to WhatsApp. Select WhatsApp from the list of apps. If you don’t see WhatsApp, tap “More” and then enable WhatsApp. Select the conversation that you want to add the sticker to.

WhatsApp does have animated stickers. The image will send, but only the first frame will be shown.