I had one like this that worked well -
https://www.amazon.com/Rabbitgoo-Harness-Lifting-Outdoor-Training/dp/B07L2TBG5C/ref=sr_1_46?dchild=1&gclid=EAIaIQobChMIr-Du3rPR6wIVcwnnCh3pcQ0DEAAYAiAAEgK2iPD_BwE&hvadid=323056927560&hvdev=c&hvlocphy=9032188&hvnetw=g&hvqmt=b&hvrand=928544584545988014&hvtargid=kwd-296817596290&hydadcr=15951_9888881&keywords=the%2Bbest%2Bdog%2Bharness&qid=1599287921&sr=8-46&tag=googhydr-20&th=1