Many years ago I ent a needle into a U shape in the ear vein of a rabbit. Attached a PVC tube , taped the tube to the ear and the taped the tube to the neck. The Rabbit flipped her ears but the needle and tube stayed in place
It depends on the diameter of the vessel. A small 1 Fr PICC has a diameter of 0.33 mm. And a 1.9 Fr PICC has a diameter of 0.63 mm. It would make inserton easier if the vessel diameter was at least 1.3 mm.