My daughter's kitten Beauchamp de Miragerie is now 4 months old. He's wild! 
D3S + 400/2.8VR. Obviously 400 mm is a bit tight indoors but anything shorter and the little fellow would be licking and playing with the lens leaving no portrait options.
20190708-_D3S3016b by foppa2011, on Flickr
D3S + 400/2.8VR. Obviously 400 mm is a bit tight indoors but anything shorter and the little fellow would be licking and playing with the lens leaving no portrait options.
20190708-_D3S3016b by foppa2011, on Flickr