weird mesh deformation

Hi! This is a simple model I want to use for a short animation. But when I move the bone for the front leg I’m getting this weird deformation. Can anyone help me?

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You have either another bone influencing the same area or you might have 2 armature modifiers (on maybe “virtual” - added when parenting the armature to the mesh and one added directly from the modifier stack) . If the latter just delete one of the modifiers . If the former go into Weight Paint with the mesh selected (from within Pose Mode) with Ctrl-Tab . Select the other bones that shouldn’t influence the legs . If the legs turn red with those other bones selected just remove the influence with “Sub” (subtract) turned on for your weight paint brush . Keep brushing until the color turns blue - this means those vertices are no longer influenced by the wrong bone ,

Thank you very much! Indeed I had a vertex group for the base bone which is nonsense, of course. I’m obviously lacking practice :o.