A process for manufacturing a puppy pad comprising a chromogenic absorbent material for detecting blood in an animal excretion on a puppy pad, comprising: providing a porous absorptive powder comprising a water-absorbing polysaccharide and a second polysaccharide mixed with the water-absorbing polysaccharide, onto a surface, thereby obtaining a powder bed, wherein the water-absorbing polysaccharide comprises pregelatinized starch, and the second polysaccharide is a crystalline polysaccharide comprising microcrystalline cellulose; releasing a chromogenic solution from a solution dispenser so as to contact the powder bed, thereby forming a solution-impregnated humid material, the chromogenic solution comprising: a trigger agent; and a chromogenic indicator oxidizable into a colored and/or fluorescent substance in the presence of the trigger agent and blood; maintaining the solution-impregnated humid material supported by the surface such that the solution-impregnated humid material is not subjected to shearing forces strong enough to cause a mechanical deformation of the solution-impregnated humid material until the solution-impregnated humid material agglomerates to produce an agglomerated humid material; drying the agglomerated humid material thereby obtaining a dried agglomerated material; and grinding and sieving the dried agglomerated material prior to being incorporated into the puppy pad, thereby forming the water-absorbing material having a particle size of 0.250-2.38 mm (8-60 mesh), and incorporating said chromogenic absorbent material between the topsheet and the second layer of the puppy pad; wherein the water-absorbing material comprises in weight: about 35% to about 65% of the water-absorbing polysaccharide, about 35% to about 65% of the second polysaccharide and up to 3 wt% of superabsorbent polymer; wherein the trigger agent, the chromogenic indicator and the detectable substance are unreactive to the absorptive material. providing a porous absorptive powder comprising a water-absorbing polysaccharide and a second polysaccharide mixed with the water-absorbing polysaccharide, onto a surface, thereby obtaining a powder bed, wherein the water-absorbing polysaccharide comprises pregelatinized starch, and the second polysaccharide is a crystalline polysaccharide comprising microcrystalline cellulose; releasing a chromogenic solution from a solution dispenser so as to contact the powder bed, thereby forming a solution-impregnated humid material, the chromogenic solution comprising: a trigger agent; and a chromogenic indicator oxidizable into a colored and/or fluorescent substance in the presence of the trigger agent and blood; a trigger agent; and a chromogenic indicator oxidizable into a colored and/or fluorescent substance in the presence of the trigger agent and blood; maintaining the solution-impregnated humid material supported by the surface such that the solution-impregnated humid material is not subjected to shearing forces strong enough to cause a mechanical deformation of the solution-impregnated humid material until the solution-impregnated humid material agglomerates to produce an agglomerated humid material; drying the agglomerated humid material thereby obtaining a dried agglomerated material; and grinding and sieving the dried agglomerated material prior to being incorporated into the puppy pad, thereby forming the water-absorbing material having a particle size of 0.250-2.38 mm (8-60 mesh), and incorporating said chromogenic absorbent material between the topsheet and the second layer of the puppy pad; wherein the water-absorbing material comprises in weight: about 35% to about 65% of the water-absorbing polysaccharide, about 35% to about 65% of the second polysaccharide and up to 3 wt% of superabsorbent polymer; wherein the trigger agent, the chromogenic indicator and the detectable substance are unreactive to the absorptive material.